From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, linux-can@vger.kernel.org,
kernel@pengutronix.de, Oleksij Rempel <o.rempel@pengutronix.de>,
syzbot+95c8e0d9dffde15b6c5c@syzkaller.appspotmail.com
Subject: [PATCH 3/9] can: j1939: main: j1939_ndev_to_priv(): avoid crash if can_ml_priv is NULL
Date: Wed, 13 Nov 2019 10:55:44 +0100 [thread overview]
Message-ID: <20191113095550.26527-4-mkl@pengutronix.de> (raw)
In-Reply-To: <20191113095550.26527-1-mkl@pengutronix.de>
From: Oleksij Rempel <o.rempel@pengutronix.de>
This patch avoids a NULL pointer deref crash if ndev->ml_priv is NULL.
Reported-by: syzbot+95c8e0d9dffde15b6c5c@syzkaller.appspotmail.com
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
net/can/j1939/main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index def2f813ffce..8dc935dc2e54 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -207,6 +207,9 @@ static inline struct j1939_priv *j1939_ndev_to_priv(struct net_device *ndev)
{
struct can_ml_priv *can_ml_priv = ndev->ml_priv;
+ if (!can_ml_priv)
+ return NULL;
+
return can_ml_priv->j1939_priv;
}
--
2.24.0
next prev parent reply other threads:[~2019-11-13 9:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-13 9:55 pull-request: can 2019-11-13 Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 1/9] can: af_can: export can_sock_destruct() Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 2/9] can: j1939: move j1939_priv_put() into sk_destruct callback Marc Kleine-Budde
2019-11-13 9:55 ` Marc Kleine-Budde [this message]
2019-11-13 9:55 ` [PATCH 4/9] can: j1939: socket: rework socket locking for j1939_sk_release() and j1939_sk_sendmsg() Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 5/9] can: j1939: transport: make sure the aborted session will be deactivated only once Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 6/9] can: j1939: make sure socket is held as long as session exists Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 7/9] can: j1939: transport: j1939_cancel_active_session(): use hrtimer_try_to_cancel() instead of hrtimer_cancel() Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 8/9] can: j1939: j1939_can_recv(): add priv refcounting Marc Kleine-Budde
2019-11-13 9:55 ` [PATCH 9/9] can: j1939: warn if resources are still linked on destroy Marc Kleine-Budde
2019-11-13 19:47 ` pull-request: can 2019-11-13 David Miller
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