Patch "drm/vc4: Fix OOPSes from trying to cache a partially constructed BO." has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-vc4-fix-oopses-from-trying-to-cache-a-partially-constructed-bo.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eric Anholt <[email protected]>
Date: Wed, 1 Mar 2017 10:56:02 -0800
Subject: drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.

From: Eric Anholt <[email protected]>

commit ca39b449f6d03e8235969f12f5dd25b8eb4304d6 upstream.

If a CMA allocation failed, the partially constructed BO would be unreferenced through the normal path, and we might choose to put it in the BO cache. If we then reused it before it expired from the cache, the kernel would OOPS.

---
 drivers/gpu/drm/vc4/vc4_bo.c |    8 ++++++++
 1 file changed, 8 insertions(+)

@@ -313,6 +313,14 @@ void vc4_free_object(struct drm_gem_obje
 		goto out;
 	}
 
+	/* If this object was partially constructed but CMA allocation
+	 * had failed, just free it.
+	 */
+	if (!bo->base.vaddr) {
+		vc4_bo_destroy(bo);
+		goto out;
+	}
+
 	cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
 	if (!cache_list) {
 		vc4_bo_destroy(bo);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-vc4-fix-oopses-from-trying-to-cache-a-partially-constructed-bo.patch