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can: j1939: transport: j1939_session_skb_drop_old(): spin_unlock_irqrestore() before kfree_skb() 

It is not allowed to call kfree_skb() from hardware interrupt context
or with interrupts being disabled. The skb is unlinked from the queue,
so it can be freed after spin_unlock_irqrestore().

Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/all/20221027091237.2290111-1-yangyingliang@huawei.com
Cc: stable@vger.kernel.org
[mkl: adjust subject]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Yang Yingliang 2022-10-27 17:12:37 +08:00 committed by Marc Kleine-Budde
parent fd0c3b763a
commit c3c06c6189
1 changed files with 3 additions and 1 deletions
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4
net/can/j1939/transport.c
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@ -342,10 +342,12 @@ static void j1939_session_skb_drop_old(struct j1939_session *session)
__skb_unlink(do_skb, &session->skb_queue);
/* drop ref taken in j1939_session_skb_queue() */
skb_unref(do_skb);
spin_unlock_irqrestore(&session->skb_queue.lock, flags);
kfree_skb(do_skb);
} else {
spin_unlock_irqrestore(&session->skb_queue.lock, flags);
}
spin_unlock_irqrestore(&session->skb_queue.lock, flags);
}
void j1939_session_skb_queue(struct j1939_session *session,