drm/atomic: Reject properties not part of the object.

The legacy setprop ioctl doesn't attempt to set properties
that are not enumerated on the object. The atomic ioctl does,
fix this by validating first.

Signed-off-by: Maarten Lankhorst <[e-mail]>
Signed-off-by: Sean Paul <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_atomic.c

···
 	struct drm_crtc_state *crtc_state;
 	unsigned plane_mask;
 	int ret = 0;
-	unsigned int i, j;
+	unsigned int i, j, k;
 
 	/* disallow for drivers not supporting atomic: */
 	if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
···
 			if (get_user(prop_id, props_ptr + copied_props)) {
 				drm_mode_object_unreference(obj);
 				ret = -EFAULT;
+				goto out;
+			}
+
+			for (k = 0; k < obj->properties->count; k++)
+				if (obj->properties->properties[k]->base.id == prop_id)
+					break;
+
+			if (k == obj->properties->count) {
+				ret = -EINVAL;
 				goto out;
 			}