Fix NULL pointer dereference caused by update_inactive()
trying to list_del() an uninitialized mm_list who's
prev/next pointers are NULL.
Signed-off-by: Alexey Minnekhanov <alexey...@postmarketos.org>
---
drivers/gpu/drm/msm/msm_gem.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index b199942266a26..b8c873fc63a78 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1227,6 +1227,13 @@ static struct drm_gem_object *_msm_gem_new(struct
drm_device *dev,
to_msm_bo(obj)->vram_node = &vma->node;
+ /* Call chain get_pages() -> update_inactive() tries to
+ * access msm_obj->mm_list, but it is not initialized yet.
+ * To avoid NULL pointer dereference error, initialize
+ * mm_list to be empty.
+ */
+ INIT_LIST_HEAD(&msm_obj->mm_list);
+
msm_gem_lock(obj);
pages = get_pages(obj);
msm_gem_unlock(obj);
--
2.26.3
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