linux-kernel - Re: [PATCH v2] cpuset: fix cpuset_print_task_mems

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Message-ID: <20130125165154.GB3081@htj.dyndns.org>
Date:	Fri, 25 Jan 2013 08:51:54 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v2] cpuset: fix cpuset_print_task_mems_allowed() vs
 rename() race

On Fri, Jan 25, 2013 at 04:08:01PM +0800, Li Zefan wrote:
> rename() will change dentry->d_name. The result of this race can
> be worse than seeing partially rewritten name, but we might access
> a stale pointer because rename() will re-allocate memory to hold
> a longer name.
> 
> It's safe in the protection of dentry->d_lock.
> 
> v2: check NULL dentry before acquiring dentry lock.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Applied to cgroup/for-3.8-fixes w/ stable cc'd.

Thanks.

-- 
tejun
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