linux-kernel - Re: [PATCH cgroup/for-3.14] cgroup: fix fail path in cgroup_load

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Message-ID: <20131213204757.GF27070@htj.dyndns.org>
Date:	Fri, 13 Dec 2013 15:47:57 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	devel@...nvz.org, Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH cgroup/for-3.14] cgroup: fix fail path in
 cgroup_load_subsys()

On Thu, Dec 12, 2013 at 11:17:08PM +0400, Vladimir Davydov wrote:
> Calling cgroup_unload_subsys() from cgroup_load_subsys() after
> online_css() failure will result in a NULL ptr dereference on attempt to
> offline_css(), because online_css() only assigns css to cgroup on
> success. Let's fix that by skipping calls to offline_css() and
> css_free() in cgroup_unload_subsys() if there is no css, and freeing css
> in cgroup_load_subsys() on online_css() failure.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Li Zefan <lizefan@...wei.com>

Applied to cgroup/for-3.14.

Thanks!

-- 
tejun
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