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tipc: call tipc_wait_for_connect only when dlen is not 0

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commit 7387a72c5f84f0dfb57618f9e4770672c0d2e4c9 upstream.

__tipc_sendmsg() is called to send SYN packet by either tipc_sendmsg()
or tipc_connect(). The difference is in tipc_connect(), it will call
tipc_wait_for_connect() after __tipc_sendmsg() to wait until connecting
is done. So there's no need to wait in __tipc_sendmsg() for this case.

This patch is to fix it by calling tipc_wait_for_connect() only when dlen
is not 0 in __tipc_sendmsg(), which means it's called by tipc_connect().

Note this also fixes the failure in tipcutils/test/ptts/:

  # ./tipcTS &
  # ./tipcTC 9
  (hang)

Fixes: 36239dab6da7 ("tipc: fix implicit-connect for SYN+")
Reported-by: Shuang Li <shuali@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xin Long 2021-08-15 03:13:36 -04:00 committed by Greg Kroah-Hartman
parent ded6da217c
commit 0a178a0151
1 changed files with 1 additions and 1 deletions
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2
net/tipc/socket.c
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@ -1511,7 +1511,7 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
if (unlikely(syn && !rc)) {
tipc_set_sk_state(sk, TIPC_CONNECTING);
if (timeout) {
if (dlen && timeout) {
timeout = msecs_to_jiffies(timeout);
tipc_wait_for_connect(sock, &timeout);
}