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can: j1939: j1939_can_recv(): add priv refcounting

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j1939_can_recv() can be called in parallel with socket release. In this
case sk_release and sk_destruct can be done earlier than
j1939_can_recv() is processed.

Reported-by: syzbot+ca172a0ac477ac90f045@syzkaller.appspotmail.com
Reported-by: syzbot+07ca5bce8530070a5650@syzkaller.appspotmail.com
Reported-by: syzbot+a47537d3964ef6c874e1@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 2019-11-09 16:11:18 +01:00 committed by Marc Kleine-Budde
parent 8d7a5f000e
commit ddeeb7d482
1 changed files with 2 additions and 0 deletions
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2
net/can/j1939/main.c
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@ -51,6 +51,7 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
if (!skb)
return;
j1939_priv_get(priv);
can_skb_set_owner(skb, iskb->sk);
/* get a pointer to the header of the skb
@ -104,6 +105,7 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
j1939_simple_recv(priv, skb);
j1939_sk_recv(priv, skb);
done:
j1939_priv_put(priv);
kfree_skb(skb);
}