Re: [PATCH] hw/virtio: vdpa: Fix leak of host-notifier memory-region

[Jason Wang]

On Sat, Feb 12, 2022 at 1:03 AM Laurent Vivier <lvivier@redhat.com> wrote:
>
> If call virtio_queue_set_host_notifier_mr fails, should free
> host-notifier memory-region.
>
> This problem can trigger a coredump with some vDPA drivers (mlx5,
> but not with the vdpasim), if we unplug the virtio-net card from
> the guest after a stop/start.
>
> The same fix has been done for vhost-user:
>   1f89d3b91e3e ("hw/virtio: Fix leak of host-notifier memory-region")
>
> Fixes: d0416d487bd5 ("vhost-vdpa: map virtqueue notification area if 
> possible")
> Cc: jasowang@redhat.com
> Resolves: https://bugzilla.redhat.com/2027208
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>

Cc: qemu-stable@nongnu.org
Acked-by: Jason Wang <jasowang@redhat.com>

> ---
>  hw/virtio/vhost-vdpa.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> index 04ea43704f5d..11f696468dc1 100644
> --- a/hw/virtio/vhost-vdpa.c
> +++ b/hw/virtio/vhost-vdpa.c
> @@ -431,6 +431,7 @@ static int vhost_vdpa_host_notifier_init(struct vhost_dev 
> *dev, int queue_index)
>      g_free(name);
>
>      if (virtio_queue_set_host_notifier_mr(vdev, queue_index, &n->mr, true)) {
> +        object_unparent(OBJECT(&n->mr));
>          munmap(addr, page_size);
>          goto err;
>      }
> --
> 2.34.1
>