[PATCH 4.9 16/21] phonet: refcount leak in pep_sock_accep

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Hangyu Hua <hbh25y@xxxxxxxxx>

commit bcd0f93353326954817a4f9fa55ec57fb38acbb0 upstream.

sock_hold(sk) is invoked in pep_sock_accept(), but __sock_put(sk) is not
invoked in subsequent failure branches(pep_accept_conn() != 0).

Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211209082839.33985-1-hbh25y@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Aayush Agarwal <aayush.a.agarwal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/phonet/pep.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -878,6 +878,7 @@ static struct sock *pep_sock_accept(stru
 
 	err = pep_accept_conn(newsk, skb);
 	if (err) {
+		__sock_put(sk);
 		sock_put(newsk);
 		newsk = NULL;
 		goto drop;