From: Eric Anholt <eric@anholt.net>
Date: Mon, 25 Jan 2016 21:05:00 +0000 (-0800)
Subject: drm/vc4: Validate that WAIT_BO padding is cleared.
X-Git-Tag: v4.14-rc1~3797^2~2^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e001523666d0b07592abe1822b78ed0e5c2a34ab;p=platform%2Fkernel%2Flinux-rpi.git

drm/vc4: Validate that WAIT_BO padding is cleared.

This is ABI future-proofing if we ever want to extend the pad to mean
something.

Signed-off-by: Eric Anholt <eric@anholt.net>
---

diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index 48ce30a..cc89ffc 100644
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -746,6 +746,9 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 
+	if (args->pad != 0)
+		return -EINVAL;
+
 	gem_obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 	if (!gem_obj) {
 		DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);