usbnet: ipheth: race between ipheth_close and error handling

[ Upstream commit e5876b0 ]

ipheth_sndbulk_callback() can submit carrier_work
as a part of its error handling. That means that
the driver must make sure that the work is cancelled
after it has made sure that no more URB can terminate
with an error condition.

Hence the order of actions in ipheth_close() needs
to be inverted.

Signed-off-by: Oliver Neukum <[email protected]>
Signed-off-by: Foster Snowhill <[email protected]>
Tested-by: Georgi Valkov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

drivers/net/usb/ipheth.c

@@ -475,8 +475,8 @@ static int ipheth_close(struct net_device *net)
 {
 	struct ipheth_device *dev = netdev_priv(net);
 
-	cancel_delayed_work_sync(&dev->carrier_work);
 	netif_stop_queue(net);
+	cancel_delayed_work_sync(&dev->carrier_work);
 	return 0;
 }