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xen-netfront: Delete rx_refill_timer in xennet_disconnect_backend()

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commit 74470954857c264168d2b5a113904cf0cfd27d18 upstream.

rx_refill_timer should be deleted as soon as we disconnect from the
backend since otherwise it is possible for the timer to go off before
we get to xennet_destroy_queues(). If this happens we may dereference
queue->rx.sring which is set to NULL in xennet_disconnect_backend().

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Boris Ostrovsky 2017-01-30 12:45:46 -05:00 committed by Greg Kroah-Hartman
parent 1c0da0ac21
commit 010ada0cfc
1 changed files with 2 additions and 1 deletions
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3
drivers/net/xen-netfront.c
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@ -1391,6 +1391,8 @@ static void xennet_disconnect_backend(struct netfront_info *info)
for (i = 0; i < num_queues && info->queues; ++i) {
struct netfront_queue *queue = &info->queues[i];
del_timer_sync(&queue->rx_refill_timer);
if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
unbind_from_irqhandler(queue->tx_irq, queue);
if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
@ -1745,7 +1747,6 @@ static void xennet_destroy_queues(struct netfront_info *info)
if (netif_running(info->netdev))
napi_disable(&queue->napi);
del_timer_sync(&queue->rx_refill_timer);
netif_napi_del(&queue->napi);
}