[PATCH] vsock: use sock_error() to consume sk_err after connect timeout

[Nguyen Dinh Phi <phind.uet@gmail.com>]

After vsock_connect() exits the wait loop due to sk->sk_err being
set, the error was read but not cleared. This left sk->sk_err set
for subsequent operations.
Switch to sock_error() which atomically reads and clears sk->sk_err,
so the error is consumed when returned.

Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Reported-by: syzbot+1b2c9c4a0f8708082678@syzkaller.appspotmail.com
---
 net/vmw_vsock/af_vsock.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 622dbd046799..43eddc33ed12 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1847,14 +1847,11 @@ static int vsock_connect(struct socket *sock, struct sockaddr_unsized *addr,
 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 	}
 
-	if (sk->sk_err) {
-		err = -sk->sk_err;
+	err = sock_error(sk);
+	if (err) {
 		sk->sk_state = TCP_CLOSE;
 		sock->state = SS_UNCONNECTED;
-	} else {
-		err = 0;
 	}
-
 out_wait:
 	finish_wait(sk_sleep(sk), &wait);
 out:
-- 
2.53.0