linux-mm.kvack.org archive mirror
 help / color / mirror / Atom feed
From: Yizhuo Zhai <yzhai003@ucr.edu>
To: Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@kernel.org>,
	 Vladimir Davydov <vdavydov.dev@gmail.com>,
	cgroups@vger.kernel.org, linux-mm@kvack.org,
	 linux-kernel@vger.kernel.org, Zhiyun Qian <zhiyunq@cs.ucr.edu>,
	 Chengyu Song <csong@cs.ucr.edu>
Subject: Potential NULL pointer deference in mm/memcontrol.c
Date: Wed, 9 Oct 2019 21:56:04 -0700	[thread overview]
Message-ID: <CABvMjLRgShsBiod+GVcqirmKeFLN_KfxdDDwGo22YK0wULepwA@mail.gmail.com> (raw)

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


             reply	other threads:[~2019-10-10  4:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10  4:56 Yizhuo Zhai [this message]
2019-10-10  7:19 ` Potential NULL pointer deference in mm/memcontrol.c Michal Hocko

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CABvMjLRgShsBiod+GVcqirmKeFLN_KfxdDDwGo22YK0wULepwA@mail.gmail.com \
    --to=yzhai003@ucr.edu \
    --cc=cgroups@vger.kernel.org \
    --cc=csong@cs.ucr.edu \
    --cc=hannes@cmpxchg.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mhocko@kernel.org \
    --cc=vdavydov.dev@gmail.com \
    --cc=zhiyunq@cs.ucr.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).