Re: [PATCH 1/2] virtio-balloon: initialize all vq callbacks

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Dec 17, 2019 at 11:06:09AM -0800, Daniel Verkamp wrote:
> Ensure that elements of the array that correspond to unavailable
> features are set to NULL; previously, they would be left uninitialized.
> 
> Since the corresponding names array elements were explicitly set to
> NULL, the uninitialized callback pointers would not actually be
> dereferenced; however, the uninitialized callbacks elements would still
> be read in vp_find_vqs_msix() and used to calculate the number of MSI-X
> vectors required.
> 
> Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
> Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>

Actually, we already have the issue with the stats VQ, no?

So I think this one is more appropriate:
Fixes: 9564e138b1f6 ("virtio: Add memory statistics reporting to the balloon driver (V4)")


> ---
>  drivers/virtio/virtio_balloon.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 93f995f6cf36..8e400ece9273 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -475,7 +475,9 @@ static int init_vqs(struct virtio_balloon *vb)
>  	names[VIRTIO_BALLOON_VQ_INFLATE] = "inflate";
>  	callbacks[VIRTIO_BALLOON_VQ_DEFLATE] = balloon_ack;
>  	names[VIRTIO_BALLOON_VQ_DEFLATE] = "deflate";
> +	callbacks[VIRTIO_BALLOON_VQ_STATS] = NULL;
>  	names[VIRTIO_BALLOON_VQ_STATS] = NULL;
> +	callbacks[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL;
>  	names[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL;
>  
>  	if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
> -- 
> 2.24.1.735.g03f4e72817-goog