From: Ursula Braun <ubraun@linux.ibm.com>
Date: Tue, 12 Nov 2019 16:03:41 +0100
Subject: net/smc: fix refcount non-blocking connect() -part 2
Git-commit: 6d6dd528d5af05dc2d0c773951ed68d630a0c3f1
Patch-mainline: v5.4-rc8
References: git-fixes

If an SMC socket is immediately terminated after a non-blocking connect()
has been called, a memory leak is possible.
Due to the sock_hold move in
commit 301428ea3708 ("net/smc: fix refcounting for non-blocking connect()")
an extra sock_put() is needed in smc_connect_work(), if the internal
TCP socket is aborted and cancels the sk_stream_wait_connect() of the
connect worker.

Reported-by: syzbot+4b73ad6fc767e576e275@syzkaller.appspotmail.com
Fixes: 301428ea3708 ("net/smc: fix refcounting for non-blocking connect()")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/af_smc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -785,6 +785,7 @@ static void smc_connect_work(struct work
 			smc->sk.sk_err = EPIPE;
 		else if (signal_pending(current))
 			smc->sk.sk_err = -sock_intr_errno(timeo);
+		sock_put(&smc->sk); /* passive closing */
 		goto out;
 	}