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| author | Fedor Pchelkin <pchelkin@ispras.ru> | 2022-08-05 18:02:16 +0300 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-08-09 09:05:06 +0200 |
| commit | 8c21c54a53ab21842f5050fa090f26b03c0313d6 (patch) | |
| tree | 2e7f11461b9d62a1e6798b71c4aa9f789569e532 | |
| parent | 8ef49f7f8244424adcf4a546dba4cbbeb0b09c09 (diff) | |
| download | linux-8c21c54a53ab21842f5050fa090f26b03c0313d6.tar.gz linux-8c21c54a53ab21842f5050fa090f26b03c0313d6.tar.bz2 linux-8c21c54a53ab21842f5050fa090f26b03c0313d6.zip | |
can: j1939: j1939_session_destroy(): fix memory leak of skbs
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.
V1: https://lore.kernel.org/all/20220708175949.539064-1-pchelkin@ispras.ru
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>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/all/20220805150216.66313-1-pchelkin@ispras.ru
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
| -rw-r--r-- | net/can/j1939/transport.c | 8 |
1 files changed, 7 insertions, 1 deletions
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); |