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Re: [Qemu-devel] [PATCH V4 07/19] virtio-net: validate backend queue num
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH V4 07/19] virtio-net: validate backend queue numbers against bus limitation |
Date: |
Wed, 18 Mar 2015 14:05:14 +0100 |
On Wed, Mar 18, 2015 at 05:34:57PM +0800, Jason Wang wrote:
> We don't validate the backend queue numbers against bus limitation,
> this will easily crash qemu if it exceeds the limitation. Fixing this
> by doing the validation and fail early.
>
> Cc: Michael S. Tsirkin <address@hidden>
> Signed-off-by: Jason Wang <address@hidden>
Bugfix? needed in 2.3?
> ---
> hw/net/virtio-net.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 27adcc5..59f76bc 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -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) {
We have this * 2 + 1 logic in several other places in this file too.
Pls wrap it up in a helper.
> + 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;
> --
> 2.1.0
- [Qemu-devel] [PATCH V4 06/19] virtio-ccw: using VIRTIO_NO_VECTOR instead of 0 for invalid virtqueue, (continued)
[Qemu-devel] [PATCH V4 05/19] monitor: check return value of qemu_find_net_clients_except(), Jason Wang, 2015/03/18
[Qemu-devel] [PATCH V4 08/19] virtio-net: fix the upper bound when trying to delete queues, Jason Wang, 2015/03/18
[Qemu-devel] [PATCH V4 07/19] virtio-net: validate backend queue numbers against bus limitation, Jason Wang, 2015/03/18
- Re: [Qemu-devel] [PATCH V4 07/19] virtio-net: validate backend queue numbers against bus limitation,
Michael S. Tsirkin <=
[Qemu-devel] [PATCH V4 10/19] virtio-ccw: introduce ccw specific queue limit, Jason Wang, 2015/03/18
[Qemu-devel] [PATCH V4 09/19] virito: introduce bus specific queue limit, Jason Wang, 2015/03/18
[Qemu-devel] [PATCH V4 11/19] virtio-s390: switch to bus specific queue limit, Jason Wang, 2015/03/18
[Qemu-devel] [PATCH V4 13/19] virtio-pci: switch to use bus specific queue limit, Jason Wang, 2015/03/18