Patch "etnaviv: fix gem object list corruption" has been added to the 4.9-stable tree

Patch "etnaviv: fix gem object list corruption" has been added to the 4.9-stable tree

[gregkh]

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

    etnaviv: fix gem object list corruption

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:
     etnaviv-fix-gem-object-list-corruption.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 <stable@vger.kernel.org> know about it.


>From 518417525f3652c12fb5fad6da4ade66c0072fa3 Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@pengutronix.de>
Date: Mon, 11 Sep 2017 15:29:31 +0200
Subject: etnaviv: fix gem object list corruption

From: Lucas Stach <l.stach@pengutronix.de>

commit 518417525f3652c12fb5fad6da4ade66c0072fa3 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>

---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -549,12 +549,15 @@ static const struct etnaviv_gem_ops etna
 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) {


Patches currently in stable-queue which might be from l.stach@pengutronix.de are

queue-4.9/etnaviv-fix-gem-object-list-corruption.patch