linux-kernel - [PATCH 5.10 075/103] tipc: call tipc_wait_for

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Date:   Wed,  1 Sep 2021 14:28:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuang Li <shuali@...hat.com>,
        Xin Long <lucien.xin@...il.com>, Jon Maloy <jmaloy@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [PATCH 5.10 075/103] tipc: call tipc_wait_for_connect only when dlen is not 0

From: Xin Long <lucien.xin@...il.com>

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@...hat.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: Jon Maloy <jmaloy@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/tipc/socket.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1511,7 +1511,7 @@ static int __tipc_sendmsg(struct socket
 
 	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);
 		}