[PATCH 5.4 56/84] net/smc: sync err code when tcp connection was refused

[Greg Kroah-Hartman]

From: liuyacan <liuyacan@xxxxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxxxx>
Reviewed-by: Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
Acked-by: Karsten Graul <kgraul@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/smc/af_smc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 5221092cc66d..a5a8cca46bd5 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -816,6 +816,8 @@ 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 */
-- 
2.35.1