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From 73042261439a2d73e4e7b711de55a8a135725739 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Thu, 9 Feb 2017 09:23:34 -0800
Subject: [PATCH] drm/vc4: Fix OOPSes from trying to cache a partially
constructed BO.
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 <eric@anholt.net>
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 ce8a5fd..d7474dd 100644
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -334,6 +334,14 @@ 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);
--
2.1.4
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