[PATCH 5.1 095/121] can: purge socket error queue on sock destruct

From: Greg Kroah-Hartman
Date: Mon Jun 24 2019 - 06:17:55 EST

From: Willem de Bruijn <willemb@xxxxxxxxxx>

commit fd704bd5ee749d560e86c4f1fd2ef486d8abf7cf upstream.

CAN supports software tx timestamps as of the below commit. Purge
any queued timestamp packets on socket destroy.

Fixes: 51f31cabe3ce ("ip: support for TX timestamps on UDP and RAW sockets")
Reported-by: syzbot+a90604060cb40f5bdd16@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

net/can/af_can.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -105,6 +105,7 @@ EXPORT_SYMBOL(can_ioctl);
static void can_sock_destruct(struct sock *sk)
+ skb_queue_purge(&sk->sk_error_queue);

static const struct can_proto *can_get_proto(int protocol)