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etnaviv: fix gem object list corruption

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commit 518417525f upstream.

All manipulations of the gem_object list need to be protected by
the list mutex, as GEM objects can be created and freed in parallel.
This fixes a kernel memory corruption.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lucas Stach
2017-09-11 15:29:31 +02:00
committed by Greg Kroah-Hartman
parent 02c7d98bec
commit 46f062e059
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/etnaviv/etnaviv_gem.c
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@@ -549,12 +549,15 @@ static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
void etnaviv_gem_free_object(struct drm_gem_object *obj)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct etnaviv_drm_private *priv = obj->dev->dev_private;
struct etnaviv_vram_mapping *mapping, *tmp;
/* object should not be active */
WARN_ON(is_active(etnaviv_obj));
mutex_lock(&priv->gem_lock);
list_del(&etnaviv_obj->gem_node);
mutex_unlock(&priv->gem_lock);
list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
obj_node) {