Re: [PATCH] mm: fix null pointer dereference in mem_cgroup_protected

[Johannes Weiner]

On Fri, Jun 08, 2018 at 06:06:07PM +0100, Roman Gushchin wrote:
> Shakeel reported a crash in mem_cgroup_protected(), which
> can be triggered by memcg reclaim if the legacy cgroup v1
> use_hierarchy=0 mode is used:
...
> Reported-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
> Signed-off-by: Roman Gushchin <guro@xxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>