summaryrefslogtreecommitdiff
path: root/net
AgeCommit message (Collapse)Author
2017-10-25Merge tag 'nfs-for-4.14-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds
Pull NFS client bugfixes from Trond Myklebust: - Fix a list corruption in xprt_release() - Fix a workqueue lockdep warning due to unsafe use of cancel_work_sync() * tag 'nfs-for-4.14-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: SUNRPC: Destroy transport from the system workqueue SUNRPC: fix a list corruption issue in xprt_release()
2017-10-21Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds
Pull networking fixes from David Miller: "A little more than usual this time around. Been travelling, so that is part of it. Anyways, here are the highlights: 1) Deal with memcontrol races wrt. listener dismantle, from Eric Dumazet. 2) Handle page allocation failures properly in nfp driver, from Jaku Kicinski. 3) Fix memory leaks in macsec, from Sabrina Dubroca. 4) Fix crashes in pppol2tp_session_ioctl(), from Guillaume Nault. 5) Several fixes in bnxt_en driver, including preventing potential NVRAM parameter corruption from Michael Chan. 6) Fix for KRACK attacks in wireless, from Johannes Berg. 7) rtnetlink event generation fixes from Xin Long. 8) Deadlock in mlxsw driver, from Ido Schimmel. 9) Disallow arithmetic operations on context pointers in bpf, from Jakub Kicinski. 10) Missing sock_owned_by_user() check in sctp_icmp_redirect(), from Xin Long. 11) Only TCP is supported for sockmap, make that explicit with a check, from John Fastabend. 12) Fix IP options state races in DCCP and TCP, from Eric Dumazet. 13) Fix panic in packet_getsockopt(), also from Eric Dumazet. 14) Add missing locked in hv_sock layer, from Dexuan Cui. 15) Various aquantia bug fixes, including several statistics handling cures. From Igor Russkikh et al. 16) Fix arithmetic overflow in devmap code, from John Fastabend. 17) Fix busted socket memory accounting when we get a fault in the tcp zero copy paths. From Willem de Bruijn. 18) Don't leave opt->tot_len uninitialized in ipv6, from Eric Dumazet" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (106 commits) stmmac: Don't access tx_q->dirty_tx before netif_tx_lock ipv6: flowlabel: do not leave opt->tot_len with garbage of_mdio: Fix broken PHY IRQ in case of probe deferral textsearch: fix typos in library helpers rxrpc: Don't release call mutex on error pointer net: stmmac: Prevent infinite loop in get_rx_timestamp_status() net: stmmac: Fix stmmac_get_rx_hwtstamp() net: stmmac: Add missing call to dev_kfree_skb() mlxsw: spectrum_router: Configure TIGCR on init mlxsw: reg: Add Tunneling IPinIP General Configuration Register net: ethtool: remove error check for legacy setting transceiver type soreuseport: fix initialization race net: bridge: fix returning of vlan range op errors sock: correct sk_wmem_queued accounting on efault in tcp zerocopy bpf: add test cases to bpf selftests to cover all access tests bpf: fix pattern matches for direct packet access bpf: fix off by one for range markings with L{T, E} patterns bpf: devmap fix arithmetic overflow in bitmap_size calculation net: aquantia: Bad udp rate on default interrupt coalescing net: aquantia: Enable coalescing management via ethtool interface ...
2017-10-22ipv6: flowlabel: do not leave opt->tot_len with garbageEric Dumazet
When syzkaller team brought us a C repro for the crash [1] that had been reported many times in the past, I finally could find the root cause. If FlowLabel info is merged by fl6_merge_options(), we leave part of the opt_space storage provided by udp/raw/l2tp with random value in opt_space.tot_len, unless a control message was provided at sendmsg() time. Then ip6_setup_cork() would use this random value to perform a kzalloc() call. Undefined behavior and crashes. Fix is to properly set tot_len in fl6_merge_options() At the same time, we can also avoid consuming memory and cpu cycles to clear it, if every option is copied via a kmemdup(). This is the change in ip6_setup_cork(). [1] kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 6613 Comm: syz-executor0 Not tainted 4.14.0-rc4+ #127 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cb64a100 task.stack: ffff8801cc350000 RIP: 0010:ip6_setup_cork+0x274/0x15c0 net/ipv6/ip6_output.c:1168 RSP: 0018:ffff8801cc357550 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: ffff8801cc357748 RCX: 0000000000000010 RDX: 0000000000000002 RSI: ffffffff842bd1d9 RDI: 0000000000000014 RBP: ffff8801cc357620 R08: ffff8801cb17f380 R09: ffff8801cc357b10 R10: ffff8801cb64a100 R11: 0000000000000000 R12: ffff8801cc357ab0 R13: ffff8801cc357b10 R14: 0000000000000000 R15: ffff8801c3bbf0c0 FS: 00007f9c5c459700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020324000 CR3: 00000001d1cf2000 CR4: 00000000001406f0 DR0: 0000000020001010 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ip6_make_skb+0x282/0x530 net/ipv6/ip6_output.c:1729 udpv6_sendmsg+0x2769/0x3380 net/ipv6/udp.c:1340 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 SYSC_sendto+0x358/0x5a0 net/socket.c:1750 SyS_sendto+0x40/0x50 net/socket.c:1718 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f9c5c458c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 0000000000000001 RSI: 0000000020fd1000 RDI: 0000000000000016 RBP: 0000000000000086 R08: 0000000020e0afe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004bb1ee R13: 00000000ffffffff R14: 0000000000000016 R15: 0000000000000029 Code: e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ea 0f 00 00 48 8d 79 04 48 b8 00 00 00 00 00 fc ff df 45 8b 74 24 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RIP: ip6_setup_cork+0x274/0x15c0 net/ipv6/ip6_output.c:1168 RSP: ffff8801cc357550 Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22rxrpc: Don't release call mutex on error pointerDavid Howells
Don't release call mutex at the end of rxrpc_kernel_begin_call() if the call pointer actually holds an error value. Fixes: 540b1c48c37a ("rxrpc: Fix deadlock between call creation and sendmsg/recvmsg") Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22net: ethtool: remove error check for legacy setting transceiver typeNiklas Söderlund
Commit 9cab88726929605 ("net: ethtool: Add back transceiver type") restores the transceiver type to struct ethtool_link_settings and convert_link_ksettings_to_legacy_settings() but forgets to remove the error check for the same in convert_legacy_settings_to_link_ksettings(). This prevents older versions of ethtool to change link settings. # ethtool --version ethtool version 3.16 # ethtool -s eth0 autoneg on speed 100 duplex full Cannot set new settings: Invalid argument not setting speed not setting duplex not setting autoneg While newer versions of ethtool works. # ethtool --version ethtool version 4.10 # ethtool -s eth0 autoneg on speed 100 duplex full [ 57.703268] sh-eth ee700000.ethernet eth0: Link is Down [ 59.618227] sh-eth ee700000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx Fixes: 19cab88726929605 ("net: ethtool: Add back transceiver type") Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reported-by: Renjith R V <renjith.rv@quest-global.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22soreuseport: fix initialization raceCraig Gallek
Syzkaller stumbled upon a way to trigger WARNING: CPU: 1 PID: 13881 at net/core/sock_reuseport.c:41 reuseport_alloc+0x306/0x3b0 net/core/sock_reuseport.c:39 There are two initialization paths for the sock_reuseport structure in a socket: Through the udp/tcp bind paths of SO_REUSEPORT sockets or through SO_ATTACH_REUSEPORT_[CE]BPF before bind. The existing implementation assumedthat the socket lock protected both of these paths when it actually only protects the SO_ATTACH_REUSEPORT path. Syzkaller triggered this double allocation by running these paths concurrently. This patch moves the check for double allocation into the reuseport_alloc function which is protected by a global spin lock. Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection") Fixes: c125e80b8868 ("soreuseport: fast reuseport TCP socket selection") Signed-off-by: Craig Gallek <kraig@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22net: bridge: fix returning of vlan range op errorsNikolay Aleksandrov
When vlan tunnels were introduced, vlan range errors got silently dropped and instead 0 was returned always. Restore the previous behaviour and return errors to user-space. Fixes: efa5356b0d97 ("bridge: per vlan dst_metadata netlink support") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22sock: correct sk_wmem_queued accounting on efault in tcp zerocopyWillem de Bruijn
Syzkaller hits WARN_ON(sk->sk_wmem_queued) in sk_stream_kill_queues after triggering an EFAULT in __zerocopy_sg_from_iter. On this error, skb_zerocopy_stream_iter resets the skb to its state before the operation with __pskb_trim. It cannot kfree_skb like datagram callers, as the skb may have data from a previous send call. __pskb_trim calls skb_condense for unowned skbs, which adjusts their truesize. These tcp skbuffs are owned and their truesize must add up to sk_wmem_queued. But they match because their skb->sk is NULL until tcp_transmit_skb. Temporarily set skb->sk when calling __pskb_trim to signal that the skbuffs are owned and avoid the skb_condense path. Fixes: 52267790ef52 ("sock: add MSG_ZEROCOPY") Signed-off-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21udp: make some messages more descriptiveMatteo Croce
In the UDP code there are two leftover error messages with very few meaning. Replace them with a more descriptive error message as some users reported them as "strange network error". Signed-off-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21Merge tag 'linux-can-fixes-for-4.14-20171019' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can Marc Kleine-Budde says: ==================== pull-request: can 2017-10-19 this is a pull request of 11 patches for the upcoming 4.14 release. There are 6 patches by ZHU Yi for the flexcan driver, that work around the CAN error handling state transition problems found in various incarnations of the flexcan IP core. The patch by Colin Ian King fixes a potential NULL pointer deref in the CAN broad cast manager (bcm). One patch by me replaces a direct deref of a RCU protected pointer by rcu_access_pointer. My second patch adds missing OOM error handling in af_can. A patch by Stefan Mätje for the esd_usb2 driver fixes the dlc in received RTR frames. And the last patch is by Wolfgang Grandegger, it fixes a busy loop in the gs_usb driver in case it runs out of TX contexts. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21hv_sock: add locking in the open/close/release code pathsDexuan Cui
Without the patch, when hvs_open_connection() hasn't completely established a connection (e.g. it has changed sk->sk_state to SS_CONNECTED, but hasn't inserted the sock into the connected queue), vsock_stream_connect() may see the sk_state change and return the connection to the userspace, and next when the userspace closes the connection quickly, hvs_release() may not see the connection in the connected queue; finally hvs_open_connection() inserts the connection into the queue, but we won't be able to purge the connection for ever. Signed-off-by: Dexuan Cui <decui@microsoft.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Cathy Avery <cavery@redhat.com> Cc: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: Marcelo Cerri <marcelo.cerri@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21net/ncsi: Fix length of GVI response packetGavin Shan
The length of GVI (GetVersionInfo) response packet should be 40 instead of 36. This issue was found from /sys/kernel/debug/ncsi/eth0/stats. # ethtool --ncsi eth0 swstats : RESPONSE OK TIMEOUT ERROR ======================================= GVI 0 0 2 With this applied, no error reported on GVI response packets: # ethtool --ncsi eth0 swstats : RESPONSE OK TIMEOUT ERROR ======================================= GVI 2 0 0 Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21net/ncsi: Enforce failover on link monitor timeoutGavin Shan
The NCSI channel has been configured to provide service if its link monitor timer is enabled, regardless of its state (inactive or active). So the timeout event on the link monitor indicates the out-of-service on that channel, for which a failover is needed. This sets NCSI_DEV_RESHUFFLE flag to enforce failover on link monitor timeout, regardless the channel's original state (inactive or active). Also, the link is put into "down" state to give the failing channel lowest priority when selecting for the active channel. The state of failing channel should be set to active in order for deinitialization and failover to be done. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21net/ncsi: Disable HWA mode when no channels are foundGavin Shan
When there are no NCSI channels probed, HWA (Hardware Arbitration) mode is enabled. It's not correct because HWA depends on the fact: NCSI channels exist and all of them support HWA mode. This disables HWA when no channels are probed. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21net/ncsi: Stop monitor if channel times out or is inactiveSamuel Mendoza-Jonas
ncsi_channel_monitor() misses stopping the channel monitor in several places that it should, causing a WARN_ON_ONCE() to trigger when the monitor is re-started later, eg: [ 459.040000] WARNING: CPU: 0 PID: 1093 at net/ncsi/ncsi-manage.c:269 ncsi_start_channel_monitor+0x7c/0x90 [ 459.040000] CPU: 0 PID: 1093 Comm: kworker/0:3 Not tainted 4.10.17-gaca2fdd #140 [ 459.040000] Hardware name: ASpeed SoC [ 459.040000] Workqueue: events ncsi_dev_work [ 459.040000] [<80010094>] (unwind_backtrace) from [<8000d950>] (show_stack+0x20/0x24) [ 459.040000] [<8000d950>] (show_stack) from [<801dbf70>] (dump_stack+0x20/0x28) [ 459.040000] [<801dbf70>] (dump_stack) from [<80018d7c>] (__warn+0xe0/0x108) [ 459.040000] [<80018d7c>] (__warn) from [<80018e70>] (warn_slowpath_null+0x30/0x38) [ 459.040000] [<80018e70>] (warn_slowpath_null) from [<803f6a08>] (ncsi_start_channel_monitor+0x7c/0x90) [ 459.040000] [<803f6a08>] (ncsi_start_channel_monitor) from [<803f7664>] (ncsi_configure_channel+0xdc/0x5fc) [ 459.040000] [<803f7664>] (ncsi_configure_channel) from [<803f8160>] (ncsi_dev_work+0xac/0x474) [ 459.040000] [<803f8160>] (ncsi_dev_work) from [<8002d244>] (process_one_work+0x1e0/0x450) [ 459.040000] [<8002d244>] (process_one_work) from [<8002d510>] (worker_thread+0x5c/0x570) [ 459.040000] [<8002d510>] (worker_thread) from [<80033614>] (kthread+0x124/0x164) [ 459.040000] [<80033614>] (kthread) from [<8000a5e8>] (ret_from_fork+0x14/0x2c) This also updates the monitor instead of just returning if ncsi_xmit_cmd() fails to send the get-link-status command so that the monitor properly times out. Fixes: e6f44ed6d04d3 "net/ncsi: Package and channel management" Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21net/ncsi: Fix AEN HNCDSC packet lengthSamuel Mendoza-Jonas
Correct the value of the HNCDSC AEN packet. Fixes: 7a82ecf4cfb85 "net/ncsi: NCSI AEN packet handler" Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21packet: avoid panic in packet_getsockopt()Eric Dumazet
syzkaller got crashes in packet_getsockopt() processing PACKET_ROLLOVER_STATS command while another thread was managing to change po->rollover Using RCU will fix this bug. We might later add proper RCU annotations for sparse sake. In v2: I replaced kfree(rollover) in fanout_add() to kfree_rcu() variant, as spotted by John. Fixes: a9b6391814d5 ("packet: rollover statistics") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: John Sperbeck <jsperbeck@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-21tcp/dccp: fix ireq->opt racesEric Dumazet
syzkaller found another bug in DCCP/TCP stacks [1] For the reasons explained in commit ce1050089c96 ("tcp/dccp: fix ireq->pktopts race"), we need to make sure we do not access ireq->opt unless we own the request sock. Note the opt field is renamed to ireq_opt to ease grep games. [1] BUG: KASAN: use-after-free in ip_queue_xmit+0x1687/0x18e0 net/ipv4/ip_output.c:474 Read of size 1 at addr ffff8801c951039c by task syz-executor5/3295 CPU: 1 PID: 3295 Comm: syz-executor5 Not tainted 4.14.0-rc4+ #80 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 ip_queue_xmit+0x1687/0x18e0 net/ipv4/ip_output.c:474 tcp_transmit_skb+0x1ab7/0x3840 net/ipv4/tcp_output.c:1135 tcp_send_ack.part.37+0x3bb/0x650 net/ipv4/tcp_output.c:3587 tcp_send_ack+0x49/0x60 net/ipv4/tcp_output.c:3557 __tcp_ack_snd_check+0x2c6/0x4b0 net/ipv4/tcp_input.c:5072 tcp_ack_snd_check net/ipv4/tcp_input.c:5085 [inline] tcp_rcv_state_process+0x2eff/0x4850 net/ipv4/tcp_input.c:6071 tcp_child_process+0x342/0x990 net/ipv4/tcp_minisocks.c:816 tcp_v4_rcv+0x1827/0x2f80 net/ipv4/tcp_ipv4.c:1682 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c341 RSP: 002b:00007f469523ec10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c341 RDX: 0000000000000037 RSI: 0000000020004000 RDI: 0000000000000015 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b7fd1 R13: 00000000ffffffff R14: 0000000020000000 R15: 0000000000025000 Allocated by task 3295: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x162/0x760 mm/slab.c:3734 kmalloc include/linux/slab.h:498 [inline] tcp_v4_save_options include/net/tcp.h:1962 [inline] tcp_v4_init_req+0x2d3/0x3e0 net/ipv4/tcp_ipv4.c:1271 tcp_conn_request+0xf6d/0x3410 net/ipv4/tcp_input.c:6283 tcp_v4_conn_request+0x157/0x210 net/ipv4/tcp_ipv4.c:1313 tcp_rcv_state_process+0x8ea/0x4850 net/ipv4/tcp_input.c:5857 tcp_v4_do_rcv+0x55c/0x7d0 net/ipv4/tcp_ipv4.c:1482 tcp_v4_rcv+0x2d10/0x2f80 net/ipv4/tcp_ipv4.c:1711 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 3306: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 inet_sock_destruct+0x59d/0x950 net/ipv4/af_inet.c:157 __sk_destruct+0xfd/0x910 net/core/sock.c:1560 sk_destruct+0x47/0x80 net/core/sock.c:1595 __sk_free+0x57/0x230 net/core/sock.c:1603 sk_free+0x2a/0x40 net/core/sock.c:1614 sock_put include/net/sock.h:1652 [inline] inet_csk_complete_hashdance+0xd5/0xf0 net/ipv4/inet_connection_sock.c:959 tcp_check_req+0xf4d/0x1620 net/ipv4/tcp_minisocks.c:765 tcp_v4_rcv+0x17f6/0x2f80 net/ipv4/tcp_ipv4.c:1675 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets") Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-20bpf: remove mark access for SK_SKB program typesJohn Fastabend
The skb->mark field is a union with reserved_tailroom which is used in the TCP code paths from stream memory allocation. Allowing SK_SKB programs to set this field creates a conflict with future code optimizations, such as "gifting" the skb to the egress path instead of creating a new skb and doing a memcpy. Because we do not have a released version of SK_SKB yet lets just remove it for now. A more appropriate scratch pad to use at the socket layer is dev_scratch, but lets add that in future kernels when needed. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-20bpf: avoid preempt enable/disable in sockmap using tcp_skb_cb regionJohn Fastabend
SK_SKB BPF programs are run from the socket/tcp context but early in the stack before much of the TCP metadata is needed in tcp_skb_cb. So we can use some unused fields to place BPF metadata needed for SK_SKB programs when implementing the redirect function. This allows us to drop the preempt disable logic. It does however require an API change so sk_redirect_map() has been updated to additionally provide ctx_ptr to skb. Note, we do however continue to disable/enable preemption around actual BPF program running to account for map updates. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-20sctp: add the missing sock_owned_by_user check in sctp_icmp_redirectXin Long
Now sctp processes icmp redirect packet in sctp_icmp_redirect where it calls sctp_transport_dst_check in which tp->dst can be released. The problem is before calling sctp_transport_dst_check, it doesn't check sock_owned_by_user, which means tp->dst could be freed while a process is accessing it with owning the socket. An use-after-free issue could be triggered by this. This patch is to fix it by checking sock_owned_by_user before calling sctp_transport_dst_check in sctp_icmp_redirect, so that it would not release tp->dst if users still hold sock lock. Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix routing redirect race") on sctp also needs this check. Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers") Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-19SUNRPC: Destroy transport from the system workqueueTrond Myklebust
The transport may need to flush transport connect and receive tasks that are running on rpciod. In order to do so safely, we need to ensure that the caller of cancel_work_sync() etc is not itself running on rpciod. Do so by running the destroy task from the system workqueue. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-10-19sctp: do not peel off an assoc from one netns to another oneXin Long
Now when peeling off an association to the sock in another netns, all transports in this assoc are not to be rehashed and keep use the old key in hashtable. As a transport uses sk->net as the hash key to insert into hashtable, it would miss removing these transports from hashtable due to the new netns when closing the sock and all transports are being freeed, then later an use-after-free issue could be caused when looking up an asoc and dereferencing those transports. This is a very old issue since very beginning, ChunYu found it with syzkaller fuzz testing with this series: socket$inet6_sctp() bind$inet6() sendto$inet6() unshare(0x40000000) getsockopt$inet_sctp6_SCTP_GET_ASSOC_ID_LIST() getsockopt$inet_sctp6_SCTP_SOCKOPT_PEELOFF() This patch is to block this call when peeling one assoc off from one netns to another one, so that the netns of all transport would not go out-sync with the key in hashtable. Note that this patch didn't fix it by rehashing transports, as it's difficult to handle the situation when the tuple is already in use in the new netns. Besides, no one would like to peel off one assoc to another netns, considering ipaddrs, ifaces, etc. are usually different. Reported-by: ChunYu Wang <chunwang@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-19can: af_can: can_pernet_init(): add missing error handling for kzalloc ↵Marc Kleine-Budde
returning NULL This patch adds the missing check and error handling for out-of-memory situations, when kzalloc cannot allocate memory. Fixes: cb5635a36776 ("can: complete initial namespace support") Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2017-10-19can: af_can: do not access proto_tab directly use rcu_access_pointer insteadMarc Kleine-Budde
"proto_tab" is a RCU protected array, when directly accessing the array, sparse throws these warnings: CHECK /srv/work/frogger/socketcan/linux/net/can/af_can.c net/can/af_can.c:115:14: error: incompatible types in comparison expression (different address spaces) net/can/af_can.c:795:17: error: incompatible types in comparison expression (different address spaces) net/can/af_can.c:816:9: error: incompatible types in comparison expression (different address spaces) This patch fixes the problem by using rcu_access_pointer() and annotating "proto_tab" array as __rcu. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2017-10-19can: bcm: check for null sk before deferencing it via the call to sock_netColin Ian King
The assignment of net via call sock_net will dereference sk. This is performed before a sanity null check on sk, so there could be a potential null dereference on the sock_net call if sk is null. Fix this by assigning net after the sk null check. Also replace the sk == NULL with the more usual !sk idiom. Detected by CoverityScan CID#1431862 ("Dereference before null check") Fixes: 384317ef4187 ("can: network namespace support for CAN_BCM protocol") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2017-10-19Merge commit 'tags/keys-fixes-20171018' into fixes-v4.14-rc5James Morris
2017-10-18netlink: fix netlink_ack() extack raceJohannes Berg
It seems that it's possible to toggle NETLINK_F_EXT_ACK through setsockopt() while another thread/CPU is building a message inside netlink_ack(), which could then trigger the WARN_ON()s I added since if it goes from being turned off to being turned on between allocating and filling the message, the skb could end up being too small. Avoid this whole situation by storing the value of this flag in a separate variable and using that throughout the function instead. Fixes: 2d4bc93368f5 ("netlink: extended ACK reporting") Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-18KEYS: Fix race between updating and finding a negative keyDavid Howells
Consolidate KEY_FLAG_INSTANTIATED, KEY_FLAG_NEGATIVE and the rejection error into one field such that: (1) The instantiation state can be modified/read atomically. (2) The error can be accessed atomically with the state. (3) The error isn't stored unioned with the payload pointers. This deals with the problem that the state is spread over three different objects (two bits and a separate variable) and reading or updating them atomically isn't practical, given that not only can uninstantiated keys change into instantiated or rejected keys, but rejected keys can also turn into instantiated keys - and someone accessing the key might not be using any locking. The main side effect of this problem is that what was held in the payload may change, depending on the state. For instance, you might observe the key to be in the rejected state. You then read the cached error, but if the key semaphore wasn't locked, the key might've become instantiated between the two reads - and you might now have something in hand that isn't actually an error code. The state is now KEY_IS_UNINSTANTIATED, KEY_IS_POSITIVE or a negative error code if the key is negatively instantiated. The key_is_instantiated() function is replaced with key_is_positive() to avoid confusion as negative keys are also 'instantiated'. Additionally, barriering is included: (1) Order payload-set before state-set during instantiation. (2) Order state-read before payload-read when using the key. Further separate barriering is necessary if RCU is being used to access the payload content after reading the payload pointers. Fixes: 146aa8b1453b ("KEYS: Merge the type-specific data with the payload data") Cc: stable@vger.kernel.org # v4.4+ Reported-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Eric Biggers <ebiggers@google.com>
2017-10-16Merge tag 'mac80211-for-davem-2017-10-16' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211 Johannes Berg says: ==================== Just a single fix, for a WoWLAN-related part of CVE-2017-13080. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16dev_ioctl: add missing NETDEV_CHANGE_TX_QUEUE_LEN event notificationXin Long
When changing dev tx_queue_len via netlink or net-sysfs, a NETDEV_CHANGE_TX_QUEUE_LEN event notification will be called. But dev_ioctl missed this event notification, which could cause no userspace notification would be sent. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16net/sched: cls_flower: Set egress_dev mark when calling into the HW driverOr Gerlitz
Commit 7091d8c '(net/sched: cls_flower: Add offload support using egress Hardware device') made sure (when fl_hw_replace_filter is called) to put the egress_dev mark on persisent structure instance. Hence, following calls into the HW driver for stats and deletion will note it and act accordingly. With commit de4784ca030f this property is lost and hence when called, the HW driver failes to operate (stats, delete) on the offloaded flow. Fix it by setting the egress_dev flag whenever the ingress device is different from the hw device since this is exactly the condition under which we're calling into the HW driver through the egress port net-device. Fixes: de4784ca030f ('net: sched: get rid of struct tc_to_netdev') Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roi Dayan <roid@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16tun: call dev_get_valid_name() before register_netdevice()Cong Wang
register_netdevice() could fail early when we have an invalid dev name, in which case ->ndo_uninit() is not called. For tun device, this is a problem because a timer etc. are already initialized and it expects ->ndo_uninit() to clean them up. We could move these initializations into a ->ndo_init() so that register_netdevice() knows better, however this is still complicated due to the logic in tun_detach(). Therefore, I choose to just call dev_get_valid_name() before register_netdevice(), which is quicker and much easier to audit. And for this specific case, it is already enough. Fixes: 96442e42429e ("tuntap: choose the txq based on rxq") Reported-by: Dmitry Alexeev <avekceeb@gmail.com> Cc: Jason Wang <jasowang@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16net: enable interface alias removal via rtnlNicolas Dichtel
IFLA_IFALIAS is defined as NLA_STRING. It means that the minimal length of the attribute is 1 ("\0"). However, to remove an alias, the attribute length must be 0 (see dev_set_alias()). Let's define the type to NLA_BINARY to allow 0-length string, so that the alias can be removed. Example: $ ip l s dummy0 alias foo $ ip l l dev dummy0 5: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether ae:20:30:4f:a7:f3 brd ff:ff:ff:ff:ff:ff alias foo Before the patch: $ ip l s dummy0 alias "" RTNETLINK answers: Numerical result out of range After the patch: $ ip l s dummy0 alias "" $ ip l l dev dummy0 5: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether ae:20:30:4f:a7:f3 brd ff:ff:ff:ff:ff:ff CC: Oliver Hartkopp <oliver@hartkopp.net> CC: Stephen Hemminger <stephen@networkplumber.org> Fixes: 96ca4a2cc145 ("net: remove ifalias on empty given alias") Reported-by: Julien FLoret <julien.floret@6wind.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: do not set notification for tx_queue_len in do_setlinkXin Long
NETDEV_CHANGE_TX_QUEUE_LEN event process in rtnetlink_event would send a notification for userspace and tx_queue_len's setting in do_setlink would trigger NETDEV_CHANGE_TX_QUEUE_LEN. So it shouldn't set DO_SETLINK_NOTIFY status for this change to send a notification any more. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlinkXin Long
The check 'status & DO_SETLINK_NOTIFY' in do_setlink doesn't really work after status & DO_SETLINK_MODIFIED, as: DO_SETLINK_MODIFIED 0x1 DO_SETLINK_NOTIFY 0x3 Considering that notifications are suppposed to be sent only when status have the flag DO_SETLINK_NOTIFY, the right check would be: (status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY This would avoid lots of duplicated notifications when setting some properties of a link. Fixes: ba9989069f4e ("rtnl/do_setlink(): notify when a netdev is modified") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: bring NETDEV_CHANGEUPPER event process back in rtnetlink_eventXin Long
libteam needs this event notification in userspace when dev's master dev has been changed. After this, the redundant notifications issue would be fixed in the later patch 'rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink'. Fixes: b6b36eb23a46 ("rtnetlink: Do not generate notifications for NETDEV_CHANGEUPPER event") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: bring NETDEV_POST_TYPE_CHANGE event process back in rtnetlink_eventXin Long
As I said in patch 'rtnetlink: bring NETDEV_CHANGEMTU event process back in rtnetlink_event', removing NETDEV_POST_TYPE_CHANGE event was not the right fix for the redundant notifications issue. So bring this event process back to rtnetlink_event and the old redundant notifications issue would be fixed in the later patch 'rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink'. Fixes: aef091ae58aa ("rtnetlink: Do not generate notifications for POST_TYPE_CHANGE event") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: bring NETDEV_CHANGE_TX_QUEUE_LEN event process back in ↵Xin Long
rtnetlink_event The same fix for changing mtu in the patch 'rtnetlink: bring NETDEV_CHANGEMTU event process back in rtnetlink_event' is needed for changing tx_queue_len. Note that the redundant notifications issue for tx_queue_len will be fixed in the later patch 'rtnetlink: do not send notification for tx_queue_len in do_setlink'. Fixes: 27b3b551d8a7 ("rtnetlink: Do not generate notifications for NETDEV_CHANGE_TX_QUEUE_LEN event") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16rtnetlink: bring NETDEV_CHANGEMTU event process back in rtnetlink_eventXin Long
Commit 085e1a65f04f ("rtnetlink: Do not generate notifications for MTU events") tried to fix the redundant notifications issue when ip link set mtu by removing NETDEV_CHANGEMTU event process in rtnetlink_event. But it also resulted in no notification generated when dev's mtu is changed via other methods, like: 'ifconfig eth1 mtu 1400' or 'echo 1400 > /sys/class/net/eth1/mtu' It would cause users not to be notified by this change. This patch is to fix it by bringing NETDEV_CHANGEMTU event back into rtnetlink_event, and the redundant notifications issue will be fixed in the later patch 'rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink'. Fixes: 085e1a65f04f ("rtnetlink: Do not generate notifications for MTU events") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-16SUNRPC: fix a list corruption issue in xprt_release()Trond Myklebust
We remove the request from the receive list before we call xprt_wait_on_pinned_rqst(), and so we need to use list_del_init(). Otherwise, we will see list corruption when xprt_complete_rqst() is called. Reported-by: Emre Celebi <emre@primarydata.com> Fixes: ce7c252a8c741 ("SUNRPC: Add a separate spinlock to protect...") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-10-16mac80211: accept key reinstall without changing anythingJohannes Berg
When a key is reinstalled we can reset the replay counters etc. which can lead to nonce reuse and/or replay detection being impossible, breaking security properties, as described in the "KRACK attacks". In particular, CVE-2017-13080 applies to GTK rekeying that happened in firmware while the host is in D3, with the second part of the attack being done after the host wakes up. In this case, the wpa_supplicant mitigation isn't sufficient since wpa_supplicant doesn't know the GTK material. In case this happens, simply silently accept the new key coming from userspace but don't take any action on it since it's the same key; this keeps the PN replay counters intact. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-10-14l2tp: check ps->sock before running pppol2tp_session_ioctl()Guillaume Nault
When pppol2tp_session_ioctl() is called by pppol2tp_tunnel_ioctl(), the session may be unconnected. That is, it was created by pppol2tp_session_create() and hasn't been connected with pppol2tp_connect(). In this case, ps->sock is NULL, so we need to check for this case in order to avoid dereferencing a NULL pointer. Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP") Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-14net: fix typo in skbuff.cWenhua Shi
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-12ip: update policy routing config helpStephen Hemminger
The kernel config help for policy routing was still pointing at an ancient document from 2000 that refers to Linux 2.1. Update it to point to something that is at least occasionally updated. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-11net/ncsi: Don't limit vids based on hot_channelSamuel Mendoza-Jonas
Currently we drop any new VLAN ids if there are more than the current (or last used) channel can support. Most importantly this is a problem if no channel has been selected yet, resulting in a segfault. Secondly this does not necessarily reflect the capabilities of any other channels. Instead only drop a new VLAN id if we are already tracking the maximum allowed by the NCSI specification. Per-channel limits are already handled by ncsi_add_filter(), but add a message to set_one_vid() to make it obvious that the channel can not support any more VLAN ids. Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-10net: call cgroup_sk_alloc() earlier in sk_clone_lock()Eric Dumazet
If for some reason, the newly allocated child need to be freed, we will call cgroup_put() (via sk_free_unlock_clone()) while the corresponding cgroup_get() was not yet done, and we will free memory too soon. Fixes: d979a39d7242 ("cgroup: duplicate cgroup reference when cloning sockets") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-10Revert "net: defer call to cgroup_sk_alloc()"Eric Dumazet
This reverts commit fbb1fb4ad415cb31ce944f65a5ca700aaf73a227. This was not the proper fix, lets cleanly revert it, so that following patch can be carried to stable versions. sock_cgroup_ptr() callers do not expect a NULL return value. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-09net: defer call to cgroup_sk_alloc()Eric Dumazet
sk_clone_lock() might run while TCP/DCCP listener already vanished. In order to prevent use after free, it is better to defer cgroup_sk_alloc() to the point we know both parent and child exist, and from process context. Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-09net: memcontrol: defer call to mem_cgroup_sk_alloc()Eric Dumazet
Instead of calling mem_cgroup_sk_alloc() from BH context, it is better to call it from inet_csk_accept() in process context. Not only this removes code in mem_cgroup_sk_alloc(), but it also fixes a bug since listener might have been dismantled and css_get() might cause a use-after-free. Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>