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From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
	David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v2] cpuset: fix cpuset_print_task_mems_allowed() vs rename() race
Date: Fri, 25 Jan 2013 08:51:54 -0800	[thread overview]
Message-ID: <20130125165154.GB3081@htj.dyndns.org> (raw)
In-Reply-To: <51023D61.9000901-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>

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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>

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

Thanks.

-- 
tejun

      parent reply	other threads:[~2013-01-25 16:51 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-25  8:08 [PATCH v2] cpuset: fix cpuset_print_task_mems_allowed() vs rename() race Li Zefan
     [not found] ` <51023D61.9000901-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-01-25 16:51   ` Tejun Heo [this message]

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