[Intel-gfx] [PATCH 1/2] drm/i915: Fix a potential UAF at device unload

[Nirmoy Das]

i915_gem_drain_freed_objects() might not be enough to
free all the objects and RCU delayed work might get
scheduled after the i915 device struct gets freed.

Call i915_gem_drain_workqueue() to catch all RCU delayed work.

Suggested-by: Chris Wilson <chris.p.wilson at intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 88df9a35e0fe..7541028caebd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1278,7 +1278,7 @@ void i915_gem_init_early(struct drm_i915_private *dev_priv)
 
 void i915_gem_cleanup_early(struct drm_i915_private *dev_priv)
 {
-	i915_gem_drain_freed_objects(dev_priv);
+	i915_gem_drain_workqueue(dev_priv);
 	GEM_BUG_ON(!llist_empty(&dev_priv->mm.free_list));
 	GEM_BUG_ON(atomic_read(&dev_priv->mm.free_count));
 	drm_WARN_ON(&dev_priv->drm, dev_priv->mm.shrink_count);
-- 
2.37.3