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tipc: fix kernel warning when sending SYN message

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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 a41dad905e ("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: f25dcc7687 ("tipc: tipc ->sendmsg() conversion")
Reported-by: [email protected]
Acked-by: Jon Maloy <[email protected]>
Signed-off-by: Tung Nguyen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Tung Nguyen authored and Jakub Kicinski committed 2023-02-14 20:46:24 -08:00
1 parent 207ce626ad
commit 11a4d6f67c
1 file changed
+2
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net/tipc/socket.c
+2
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@@ -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: