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virtio-net: only delete bh that existed 

We delete without check whether it existed during exit. This will lead NULL
pointer deference since it was created conditionally depends on guest driver
status and features. So add a check of existence before trying to delete it.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2013-11-06 16:58:08 +08:00 committed by Michael S. Tsirkin
parent 04c7d8b8de
commit 6b9b8758c1
1 changed files with 1 additions and 1 deletions
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2
hw/net/virtio-net.c
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@ -1601,7 +1601,7 @@ static int virtio_net_device_exit(DeviceState *qdev)
if (q->tx_timer) {
timer_del(q->tx_timer);
timer_free(q->tx_timer);
} else {
} else if (q->tx_bh) {
qemu_bh_delete(q->tx_bh);
}
}