github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-07 14:04:54 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

can: j1939: j1939_session_destroy(): fix memory leak of skbs

Browse Source 
commit 8c21c54a53 upstream.

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: 9d71dd0c70 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fedor Pchelkin 2022-08-05 18:02:16 +03:00 committed by Greg Kroah-Hartman
parent 05b9b0a7a7
commit a220ff3433
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/can/j1939/transport.c
View File

@ -260,6 +260,8 @@ static void __j1939_session_drop(struct j1939_session *session)
static void j1939_session_destroy(struct j1939_session *session) static void j1939_session_destroy(struct j1939_session *session)
{ {
struct sk_buff *skb;
if (session->err) if (session->err)
j1939_sk_errqueue(session, J1939_ERRQUEUE_ABORT); j1939_sk_errqueue(session, J1939_ERRQUEUE_ABORT);
else else
@ -270,7 +272,11 @@ 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->sk_session_queue_entry));
WARN_ON_ONCE(!list_empty(&session->active_session_list_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_session_drop(session);
j1939_priv_put(session->priv); j1939_priv_put(session->priv);
kfree(session); kfree(session);