[PATCH 5.10 059/103] virtio_vdpa: reject invalid vq indices

[Greg Kroah-Hartman]

From: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>

[ Upstream commit cb5d2c1f6cc0e5769099a7d44b9d08cf58cae206 ]

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@xxxxxxxx>
Link: https://lore.kernel.org/r/20210701114652.21956-1-vincent.whitchurch@xxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 4a9ddb44b2a7..3f95dedccceb 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);
-- 
2.30.2