From patchwork Thu Feb 9 18:16:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: drm/vc4: Fix OOPSes from trying to cache a partially constructed BO. From: Eric Anholt X-Patchwork-Id: 138087 Message-Id: <20170209181600.24048-1-eric@anholt.net> To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, pbrobinson@gmail.com Date: Thu, 9 Feb 2017 10:16:00 -0800 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. Signed-off-by: Eric Anholt Fixes: c826a6e10644 ("drm/vc4: Add a BO cache.") --- drivers/gpu/drm/vc4/vc4_bo.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c index 5ec14f25625d..fd83a2807656 100644 --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -314,6 +314,14 @@ void vc4_free_object(struct drm_gem_object *gem_bo) 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);