From: Xin Long <lucien.xin@gmail.com> mainline inclusion from mainline-5.10.62 commit 0a178a01516158caeb3aa26c1b54d50ad12333f6 bugzilla: 182217 https://gitee.com/openeuler/kernel/issues/I4EFOS Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- 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> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- net/tipc/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 4f9bd95b4eee..9bd72468bc68 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -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); } -- 2.20.1