linux-kernel - [PATCH AUTOSEL 4.4 3/4] phonet: refcount leak in pep_sock

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Message-Id: <20211221020206.117771-3-sashal@kernel.org>
Date:   Mon, 20 Dec 2021 21:02:05 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hangyu Hua <hbh25y@...il.com>, Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, courmisch@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 3/4] phonet: refcount leak in pep_sock_accep

From: Hangyu Hua <hbh25y@...il.com>

[ Upstream commit bcd0f93353326954817a4f9fa55ec57fb38acbb0 ]

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@...il.com>
Link: https://lore.kernel.org/r/20211209082839.33985-1-hbh25y@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/phonet/pep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index f6aa532bcbf64..65883d1b9ec72 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -878,6 +878,7 @@ static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
 
 	err = pep_accept_conn(newsk, skb);
 	if (err) {
+		__sock_put(sk);
 		sock_put(newsk);
 		newsk = NULL;
 		goto drop;
-- 
2.34.1