net/smc: sync err code when tcp connection was refused

[ Upstream commit 4e2e65e2e56c6ceb4ea1719360080c0af083229e ]

In the current implementation, when TCP initiates a connection
to an unavailable [ip,port], ECONNREFUSED will be stored in the
TCP socket, but SMC will not. However, some apps (like curl) use
getsockopt(,,SO_ERROR,,) to get the error information, which makes
them miss the error message and behave strangely.

Fixes: 50717a37db03 ("net/smc: nonblocking connect rework")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 499058248bdb850c17676e6abbaf05acc3567e1b..fb801c249d92381e79f7e6e21f2b20e25a672797 100644 (file)
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1223,6 +1223,8 @@ static void smc_connect_work(struct work_struct *work)
                smc->sk.sk_state = SMC_CLOSED;
                if (rc == -EPIPE || rc == -EAGAIN)
                        smc->sk.sk_err = EPIPE;
+               else if (rc == -ECONNREFUSED)
+                       smc->sk.sk_err = ECONNREFUSED;
                else if (signal_pending(current))
                        smc->sk.sk_err = -sock_intr_errno(timeo);
                sock_put(&smc->sk); /* passive closing */