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can: j1939: main: j1939_ndev_to_priv(): avoid crash if can_ml_priv is NULL 

This patch avoids a NULL pointer deref crash if ndev->ml_priv is NULL.

Reported-by: syzbot+95c8e0d9dffde15b6c5c@syzkaller.appspotmail.com
Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
This commit is contained in:
Oleksij Rempel 2019-11-05 11:07:08 +01:00 committed by Marc Kleine-Budde
parent 25fe97cb76
commit c48c8c1e2e
1 changed files with 3 additions and 0 deletions
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3
net/can/j1939/main.c
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@ -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; struct can_ml_priv *can_ml_priv = ndev->ml_priv;
if (!can_ml_priv)
return NULL;
return can_ml_priv->j1939_priv; return can_ml_priv->j1939_priv;
} }