linux-kernel - Potential NULL pointer deference in mm/memcontrol.c

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Date:   Wed, 9 Oct 2019 21:56:04 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Zhiyun Qian <zhiyunq@...ucr.edu>,
        Chengyu Song <csong@...ucr.edu>
Subject: Potential NULL pointer deference in mm/memcontrol.c

Hi All:
mm/memcontrol.c:
The function mem_cgroup_from_css() could return NULL, but some callers
in this file
checks the return value but directly dereference it, which seems
potentially unsafe.
Such callers include mem_cgroup_hierarchy_read(),
mem_cgroup_hierarchy_write(), mem_cgroup_read_u64(),
mem_cgroup_reset(), etc.
-- 
Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside