tree 3d6f820b4409859fc97e4dfc8a3c90d936d27b24
parent 0be8669dd530f60cf3f59f084518570c1dfb47ee
author Vladimir Davydov <vdavydov@parallels.com> 1386875828 +0400
committer Tejun Heo <tj@kernel.org> 1386967609 -0500

cgroup: fix fail path in cgroup_load_subsys()

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@parallels.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>