linux-kernel - Re: [PATCH] virtio_vdpa: reject invalid vq indices

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Date:   Mon, 5 Jul 2021 17:51:33 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, kernel@...s.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_vdpa: reject invalid vq indices

On Thu, Jul 01, 2021 at 01:46:52PM +0200, Vincent Whitchurch wrote:
>Do not call vDPA drivers' callbacks with vq indicies larger than what
>the drivers indicate that they support.  vDPA drivers do not bounds
>check the indices.
>
>Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
>---
> drivers/virtio/virtio_vdpa.c | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
>index e28acf482e0c..e9b9dd03f44a 100644
>--- a/drivers/virtio/virtio_vdpa.c
>+++ b/drivers/virtio/virtio_vdpa.c
>@@ -149,6 +149,9 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
> 	if (!name)
> 		return NULL;
>
>+	if (index >= vdpa->nvqs)
>+		return ERR_PTR(-ENOENT);
>+
> 	/* Queue shouldn't already be set up. */
> 	if (ops->get_vq_ready(vdpa, index))
> 		return ERR_PTR(-ENOENT);
>-- 
>2.28.0
>

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>