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

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Date:	Fri, 13 Dec 2013 11:20:50 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<devel@...nvz.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH cgroup/for-3.14] cgroup: fix fail path in cgroup_load_subsys()

On 2013/12/13 3:17, 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>

I don't have strong preference on which way to go.

Acked-by: Li Zefan <lizefan@...wei.com>

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