linux-kernel - [PATCH 0/2] cgroup: pids: fix invalid reference semantics

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Message-Id: <1440335432-4202-1-git-send-email-cyphar@cyphar.com>
Date:	Sun, 23 Aug 2015 23:10:30 +1000
From:	Aleksa Sarai <cyphar@...har.com>
To:	tj@...nel.org
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Aleksa Sarai <cyphar@...har.com>
Subject: [PATCH 0/2] cgroup: pids: fix invalid reference semantics

I've discovered a bug in the PIDs cgroup. We aren't properly dealing
with css references (we grab a reference to a css in ->can_attach() and
then drop a reference to a *different* css in ->{cancel_,}attach(). This
is a quick patch I wrote which I believe fixes the problem by getting
cgroup_migrate() to grab a reference before ->can_attach() and once the
attach has failed or succeded.

Aleksa Sarai (2):
  cgroup: get a ref to source csses when migrating
  cgroup: pids: fix invalid get/put usage

 kernel/cgroup.c      | 21 +++++++++++++++++++--
 kernel/cgroup_pids.c | 13 +------------
 2 files changed, 20 insertions(+), 14 deletions(-)

-- 
2.5.0

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