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virtio-net: validate backend queue numbers against bus limitation 

We don't validate the backend queue numbers against bus limitation,
this will easily crash qemu if it exceeds the limitation which will
hit the abort() in virtio_del_queue(). An example is trying to
starting a virtio-net device with 256 queues. E.g:

./qemu-system-x86_64 -netdev tap,id=hn0,queues=256 -device
virtio-net-pci,netdev=hn0

Fixing this by doing the validation and fail early.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-stable <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>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jason Wang 2015-03-20 14:07:50 +08:00 committed by Michael S. Tsirkin
parent 7976a6d231
commit 7e0e736ecd
1 changed files with 7 additions and 0 deletions
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7
hw/net/virtio-net.c
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@ -1588,6 +1588,13 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
n->max_queues = MAX(n->nic_conf.peers.queues, 1);
if (n->max_queues * 2 + 1 > VIRTIO_PCI_QUEUE_MAX) {
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
"must be a postive integer less than %d.",
n->max_queues, (VIRTIO_PCI_QUEUE_MAX - 1) / 2);
virtio_cleanup(vdev);
return;
}
n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
n->curr_queues = 1;