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authorTung Nguyen <tung.q.nguyen@dektech.com.au>2023-02-14 01:26:06 +0000
committerJakub Kicinski <kuba@kernel.org>2023-02-14 20:46:24 -0800
commit11a4d6f67cf55883dc78e31c247d1903ed7feccc (patch)
tree9d38220e5133a7792620740ac4a99b9f2ce40fd0 /net
parent207ce626add80ddd941f62fc2fe5d77586e0801b (diff)
tipc: fix kernel warning when sending SYN message
When sending a SYN message, this kernel stack trace is observed: ... [ 13.396352] RIP: 0010:_copy_from_iter+0xb4/0x550 ... [ 13.398494] Call Trace: [ 13.398630] <TASK> [ 13.398630] ? __alloc_skb+0xed/0x1a0 [ 13.398630] tipc_msg_build+0x12c/0x670 [tipc] [ 13.398630] ? shmem_add_to_page_cache.isra.71+0x151/0x290 [ 13.398630] __tipc_sendmsg+0x2d1/0x710 [tipc] [ 13.398630] ? tipc_connect+0x1d9/0x230 [tipc] [ 13.398630] ? __local_bh_enable_ip+0x37/0x80 [ 13.398630] tipc_connect+0x1d9/0x230 [tipc] [ 13.398630] ? __sys_connect+0x9f/0xd0 [ 13.398630] __sys_connect+0x9f/0xd0 [ 13.398630] ? preempt_count_add+0x4d/0xa0 [ 13.398630] ? fpregs_assert_state_consistent+0x22/0x50 [ 13.398630] __x64_sys_connect+0x16/0x20 [ 13.398630] do_syscall_64+0x42/0x90 [ 13.398630] entry_SYSCALL_64_after_hwframe+0x63/0xcd It is because commit a41dad905e5a ("iov_iter: saner checks for attempt to copy to/from iterator") has introduced sanity check for copying from/to iov iterator. Lacking of copy direction from the iterator viewpoint would lead to kernel stack trace like above. This commit fixes this issue by initializing the iov iterator with the correct copy direction when sending SYN or ACK without data. Fixes: f25dcc7687d4 ("tipc: tipc ->sendmsg() conversion") Reported-by: syzbot+d43608d061e8847ec9f3@syzkaller.appspotmail.com Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Link: https://lore.kernel.org/r/20230214012606.5804-1-tung.q.nguyen@dektech.com.au Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/tipc/socket.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index b35c8701876a..a38733f2197a 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2614,6 +2614,7 @@ static int tipc_connect(struct socket *sock, struct sockaddr *dest,
/* Send a 'SYN-' to destination */
m.msg_name = dest;
m.msg_namelen = destlen;
+ iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
/* If connect is in non-blocking case, set MSG_DONTWAIT to
* indicate send_msg() is never blocked.
@@ -2776,6 +2777,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
__skb_queue_head(&new_sk->sk_receive_queue, buf);
skb_set_owner_r(buf, new_sk);
}
+ iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
__tipc_sendstream(new_sock, &m, 0);
release_sock(new_sk);
exit: