drm: check for garbage in unused addfb2 fields

Unfortunately old userspace didn't clear this properly, but since
we've added fb modifiers that's fixed. Checking properly that unused
fields is important for abi extensions, and just right now there's a
bunch of discussions going on about how exactly the additional aux
planes for render compression should be specified.

So let's first make sure that the values in those additional fields
can be indeed used.

Cc: Thierry Reding <thierry.reding@gmail.com>
Testcase: igt/kms_addfb/unused-*
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 2de6edf821c75ecd74441a88355ce02eb1c4a9c8..098c94e53fdf8c5bb340611eb5fca4d1129fc052 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3249,6 +3249,32 @@ static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
                }
        }
 
+       for (i = num_planes; i < 4; i++) {
+               if (r->modifier[i]) {
+                       DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
+                       return -EINVAL;
+               }
+
+               /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
+               if (!(r->flags & DRM_MODE_FB_MODIFIERS))
+                       continue;
+
+               if (r->handles[i]) {
+                       DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
+                       return -EINVAL;
+               }
+
+               if (r->pitches[i]) {
+                       DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
+                       return -EINVAL;
+               }
+
+               if (r->offsets[i]) {
+                       DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
+                       return -EINVAL;
+               }
+       }
+
        return 0;
 }