From: Fedor Pchelkin <pchelkin@ispras.ru>
To: Oleksij Rempel <o.rempel@pengutronix.de>,
Robin van der Gracht <robin@protonic.nl>
Cc: Fedor Pchelkin <pchelkin@ispras.ru>,
kernel@pengutronix.de, Oliver Hartkopp <socketcan@hartkopp.net>,
Marc Kleine-Budde <mkl@pengutronix.de>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
linux-can@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, ldv-project@linuxtesting.org,
Alexey Khoroshilov <khoroshilov@ispras.ru>
Subject: [PATCH] can: j1939: fix memory leak of skbs
Date: Fri, 5 Aug 2022 18:02:16 +0300 [thread overview]
Message-ID: <20220805150216.66313-1-pchelkin@ispras.ru> (raw)
We need to drop skb references taken in j1939_session_skb_queue() when
destroying a session in j1939_session_destroy(). Otherwise those skbs
would be lost.
Link to Syzkaller info and repro: https://forge.ispras.ru/issues/11743.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
net/can/j1939/transport.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 307ee1174a6e..d7d86c944d76 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -260,6 +260,8 @@ static void __j1939_session_drop(struct j1939_session *session)
static void j1939_session_destroy(struct j1939_session *session)
{
+ struct sk_buff *skb;
+
if (session->transmission) {
if (session->err)
j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ABORT);
@@ -274,7 +276,11 @@ static void j1939_session_destroy(struct j1939_session *session)
WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
- skb_queue_purge(&session->skb_queue);
+ while ((skb = skb_dequeue(&session->skb_queue)) != NULL) {
+ /* drop ref taken in j1939_session_skb_queue() */
+ skb_unref(skb);
+ kfree_skb(skb);
+ }
__j1939_session_drop(session);
j1939_priv_put(session->priv);
kfree(session);
--
2.25.1
next reply other threads:[~2022-08-05 15:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-05 15:02 Fedor Pchelkin [this message]
2022-08-05 16:20 ` [PATCH] can: j1939: fix memory leak of skbs Oleksij Rempel
2022-08-08 7:56 ` Marc Kleine-Budde
-- strict thread matches above, loose matches on Subject: below --
2022-07-08 17:59 Fedor Pchelkin
2022-07-29 4:22 ` Oleksij Rempel
2022-08-05 8:56 ` Fedor Pchelkin
2022-08-05 9:55 ` Oleksij Rempel
2022-08-05 14:55 ` Fedor Pchelkin
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