drm: Set cliprects to NULL when changing drawable to having 0 cliprects.
This avoids setting the cliprects pointer to a zero-sized allocation.
Signed-off-by: Zhenyu Wang <zhenyu.z.wang@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_drawable.c b/drivers/gpu/drm/drm_drawable.c
index 1839c57..70b15d1 100644
--- a/drivers/gpu/drm/drm_drawable.c
+++ b/drivers/gpu/drm/drm_drawable.c
@@ -111,7 +111,9 @@
switch (update->type) {
case DRM_DRAWABLE_CLIPRECTS:
- if (update->num != info->num_rects) {
+ if (update->num == 0)
+ rects = NULL;
+ else if (update->num != info->num_rects) {
rects = drm_alloc(update->num * sizeof(struct drm_clip_rect),
DRM_MEM_BUFS);
} else