Re: [Qemu-devel] [PATCH for-2.3 2/4] virtio-ccw: range check in READ_VQ_CONF

[Christian Borntraeger <borntraeger@de.ibm.com>]

Am 26.03.2015 um 16:36 schrieb Cornelia Huck:
> Processing for READ_VQ_CONF needs to check whether the requested queue
> value is actually in the supported range and post a channel program
> check if not.
> 
> Cc: qemu-stable@nongnu.org
> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

> ---
>  hw/s390x/virtio-ccw.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index ceb6a45..d32ecaf 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -549,6 +549,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
>              ret = -EFAULT;
>          } else {
>              vq_config.index = lduw_be_phys(&address_space_memory, ccw.cda);
> +            if (vq_config.index >= VIRTIO_PCI_QUEUE_MAX) {
> +                ret = -EINVAL;
> +                break;
> +            }
>              vq_config.num_max = virtio_queue_get_num(vdev,
>                                                       vq_config.index);
>              stw_be_phys(&address_space_memory,
>