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authorJouni Hogander <jouni.hogander@unikie.com>2019-11-20 09:08:16 +0200
committerDavid S. Miller <davem@davemloft.net>2019-11-20 12:09:50 -0800
commitb8eb718348b8fb30b5a7d0a8fce26fb3f4ac741b (patch)
treee92e5c1200b002dc8212be87e5214e9e48d1efb8
parent6e4ff1c94a0477598ddbe4da47530aecdb4f7dff (diff)
net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject
kobject_init_and_add takes reference even when it fails. This has to be given up by the caller in error handling. Otherwise memory allocated by kobject_init_and_add is never freed. Originally found by Syzkaller: BUG: memory leak unreferenced object 0xffff8880679f8b08 (size 8): comm "netdev_register", pid 269, jiffies 4294693094 (age 12.132s) hex dump (first 8 bytes): 72 78 2d 30 00 36 20 d4 rx-0.6 . backtrace: [<000000008c93818e>] __kmalloc_track_caller+0x16e/0x290 [<000000001f2e4e49>] kvasprintf+0xb1/0x140 [<000000007f313394>] kvasprintf_const+0x56/0x160 [<00000000aeca11c8>] kobject_set_name_vargs+0x5b/0x140 [<0000000073a0367c>] kobject_init_and_add+0xd8/0x170 [<0000000088838e4b>] net_rx_queue_update_kobjects+0x152/0x560 [<000000006be5f104>] netdev_register_kobject+0x210/0x380 [<00000000e31dab9d>] register_netdevice+0xa1b/0xf00 [<00000000f68b2465>] __tun_chr_ioctl+0x20d5/0x3dd0 [<000000004c50599f>] tun_chr_ioctl+0x2f/0x40 [<00000000bbd4c317>] do_vfs_ioctl+0x1c7/0x1510 [<00000000d4c59e8f>] ksys_ioctl+0x99/0xb0 [<00000000946aea81>] __x64_sys_ioctl+0x78/0xb0 [<0000000038d946e5>] do_syscall_64+0x16f/0x580 [<00000000e0aa5d8f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [<00000000285b3d1a>] 0xffffffffffffffff Cc: David Miller <davem@davemloft.net> Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com> Signed-off-by: Jouni Hogander <jouni.hogander@unikie.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/net-sysfs.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 865ba6ca16eb..4f404bf33e44 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -923,21 +923,23 @@ static int rx_queue_add_kobject(struct net_device *dev, int index)
error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
"rx-%u", index);
if (error)
- return error;
+ goto err;
dev_hold(queue->dev);
if (dev->sysfs_rx_queue_group) {
error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
- if (error) {
- kobject_put(kobj);
- return error;
- }
+ if (error)
+ goto err;
}
kobject_uevent(kobj, KOBJ_ADD);
return error;
+
+err:
+ kobject_put(kobj);
+ return error;
}
#endif /* CONFIG_SYSFS */
@@ -1461,21 +1463,21 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
"tx-%u", index);
if (error)
- return error;
+ goto err;
dev_hold(queue->dev);
#ifdef CONFIG_BQL
error = sysfs_create_group(kobj, &dql_group);
- if (error) {
- kobject_put(kobj);
- return error;
- }
+ if (error)
+ goto err;
#endif
kobject_uevent(kobj, KOBJ_ADD);
- return 0;
+err:
+ kobject_put(kobj);
+ return error;
}
#endif /* CONFIG_SYSFS */