Using a spinlock to serialize the destroy function, within the destroy
function itself does not prevent the buggy driver from shooting
themselves in the foot - either way they still have a use-after-free
issue.
Reported-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/drm_vma_manager.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_vma_manager.c b/drivers/gpu/drm/drm_vma_manager.c
index a6b2fe36b025..c5d0d2358301 100644
--- a/drivers/gpu/drm/drm_vma_manager.c
+++ b/drivers/gpu/drm/drm_vma_manager.c
@@ -103,10 +103,7 @@ EXPORT_SYMBOL(drm_vma_offset_manager_init);
*/
void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr)
{
- /* take the lock to protect against buggy drivers */
- write_lock(&mgr->vm_lock);
drm_mm_takedown(&mgr->vm_addr_space_mm);
- write_unlock(&mgr->vm_lock);
}
EXPORT_SYMBOL(drm_vma_offset_manager_destroy);
--
2.19.0.rc1
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