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SubjectRe: [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 <>

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

Acked-by: Li Zefan <>

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