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virtio_net: fix virtnet_open and virtnet_probe competing for try_fill_recv 

In function virtnet_open() and virtnet_probe(), func try_fill_recv() may
be executed at the same time. VQ in virtqueue_add() has not been protected
well and BUG_ON will be triggered when virito_net.ko being removed.

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wangyunjian 2016-05-31 11:52:43 +08:00 committed by David S. Miller
parent bae5499cc5
commit f00e35e259
1 changed files with 2 additions and 16 deletions
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18
drivers/net/virtio_net.c
View File

@ -1925,24 +1925,11 @@ static int virtnet_probe(struct virtio_device *vdev)
virtio_device_ready(vdev);
/* Last of all, set up some receive buffers. */
for (i = 0; i < vi->curr_queue_pairs; i++) {
try_fill_recv(vi, &vi->rq[i], GFP_KERNEL);
/* If we didn't even get one input buffer, we're useless. */
if (vi->rq[i].vq->num_free ==
virtqueue_get_vring_size(vi->rq[i].vq)) {
free_unused_bufs(vi);
err = -ENOMEM;
goto free_recv_bufs;
}
}
vi->nb.notifier_call = &virtnet_cpu_callback;
err = register_hotcpu_notifier(&vi->nb);
if (err) {
pr_debug("virtio_net: registering cpu notifier failed\n");
goto free_recv_bufs;
goto free_unregister_netdev;
}
/* Assume link up if device can't report link status,
@ -1960,10 +1947,9 @@ static int virtnet_probe(struct virtio_device *vdev)
return 0;
free_recv_bufs:
free_unregister_netdev:
vi->vdev->config->reset(vdev);
free_receive_bufs(vi);
unregister_netdev(dev);
free_vqs:
cancel_delayed_work_sync(&vi->refill);