linux-kernel - Re: [PATCH] cgroup: fix unbalanced locking

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Message-ID: <20140918163412.GB13573@mtj.dyndns.org>
Date:	Thu, 18 Sep 2014 12:34:12 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Zefan Li <lizefan@...wei.com>
Cc:	Cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroup: fix unbalanced locking

On Thu, Sep 18, 2014 at 05:28:46PM +0800, Zefan Li wrote:
> cgroup_pidlist_start() holds cgrp->pidlist_mutex and then calls
> pidlist_array_load(), and cgroup_pidlist_stop() releases the mutex.
> 
> It is wrong that we release the mutex in the failure path in
> pidlist_array_load(), because cgroup_pidlist_stop() will be called
> no matter if cgroup_pidlist_start() returns errno or not.
> 
> Fixes: 4bac00d16a8760eae7205e41d2c246477d42a210
> Cc: <stable@...r.kernel.org> # 3.14+
> Signed-off-by: Zefan Li <lizefan@...wei.com>

Applied to cgroup/for-3.17-fixes.

Thanks.

-- 
tejun
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