The patch titled
Subject: memcg: avoid accessing memcg after releasing reference
has been added to the -mm tree. Its filename is
memcg-avoid-accessing-memcg-after-releasing-reference.patch
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------------------------------------------------------
From: Li Zefan <lizefan@xxxxxxxxxx>
Subject: memcg: avoid accessing memcg after releasing reference
This might cause a use-after-free bug.
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/memcontrol.c~memcg-avoid-accessing-memcg-after-releasing-reference mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-avoid-accessing-memcg-after-releasing-reference
+++ a/mm/memcontrol.c
@@ -3215,12 +3215,12 @@ void memcg_release_cache(struct kmem_cac
root = s->memcg_params->root_cache;
root->memcg_params->memcg_caches[id] = NULL;
- mem_cgroup_put(memcg);
mutex_lock(&memcg->slab_caches_mutex);
list_del(&s->memcg_params->list);
mutex_unlock(&memcg->slab_caches_mutex);
+ mem_cgroup_put(memcg);
out:
kfree(s->memcg_params);
}
_
Patches currently in -mm which might be from lizefan@xxxxxxxxxx are
linux-next.patch
memcg-keep-prevs-css-alive-for-the-whole-mem_cgroup_iter.patch
memcg-rework-mem_cgroup_iter-to-use-cgroup-iterators.patch
memcg-relax-memcg-iter-caching.patch
memcg-simplify-mem_cgroup_iter.patch
memcg-further-simplify-mem_cgroup_iter.patch
cgroup-remove-css_get_next.patch
kernel-cpusetc-use-register_hotmemory_notifier.patch
memcg-avoid-accessing-memcg-after-releasing-reference.patch
exec-do-not-abuse-cred_guard_mutex-in-threadgroup_lock.patch
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