[PATCH v2 2/3] drm/virtio: honor blob_alignment requirements

[Sergio Lopez <slp@redhat.com>]

If VIRTIO_GPU_F_BLOB_ALIGNMENT has been negotiated, blob size must be
aligned to blob_alignment. Validate this in verify_blob() so that
invalid requests are rejected early.

Signed-off-by: Sergio Lopez <slp@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index c33c057365f8..d0c4edf1eaf4 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -489,6 +489,11 @@ static int verify_blob(struct virtio_gpu_device *vgdev,
 	params->size = rc_blob->size;
 	params->blob = true;
 	params->blob_flags = rc_blob->blob_flags;
+
+	if (vgdev->has_blob_alignment &&
+	    !IS_ALIGNED(params->size, vgdev->blob_alignment))
+		return -EINVAL;
+
 	return 0;
 }
 
-- 
2.53.0