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net/xen-netfront: only clean up queues if present

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If you simply load and unload the module without starting the interfaces,
the queues are never created and you get a bad pointer dereference.

Signed-off-by: Chas Williams <3chas3@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chas Williams 2015-08-19 19:14:20 -04:00 committed by David S. Miller
parent f5117ce4f6
commit 9a873c71e9
1 changed files with 3 additions and 2 deletions
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5
drivers/net/xen-netfront.c
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@ -1336,7 +1336,7 @@ static void xennet_disconnect_backend(struct netfront_info *info)
netif_carrier_off(info->netdev);
for (i = 0; i < num_queues; ++i) {
for (i = 0; i < num_queues && info->queues; ++i) {
struct netfront_queue *queue = &info->queues[i];
if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
@ -2101,7 +2101,8 @@ static int xennet_remove(struct xenbus_device *dev)
unregister_netdev(info->netdev);
xennet_destroy_queues(info);
if (info->queues)
xennet_destroy_queues(info);
xennet_free_netdev(info->netdev);
return 0;