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can: j1939: make sure socket is held as long as session exists 

We link the socket to the session to be able provide socket specific
notifications. For example messages over error queue.

We need to keep the socket held, while we have a reference to it.

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 2019-11-07 18:51:40 +01:00 committed by Marc Kleine-Budde
parent d966635b38
commit 62ebce1dc1
1 changed files with 2 additions and 0 deletions
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2
net/can/j1939/transport.c
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@ -255,6 +255,7 @@ static void __j1939_session_drop(struct j1939_session *session)
return;
j1939_sock_pending_del(session->sk);
sock_put(session->sk);
}
static void j1939_session_destroy(struct j1939_session *session)
@ -1875,6 +1876,7 @@ struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
return ERR_PTR(-ENOMEM);
/* skb is recounted in j1939_session_new() */
sock_hold(skb->sk);
session->sk = skb->sk;
session->transmission = true;
session->pkt.total = (size + 6) / 7;