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cgroups: add lock for child->cgroups in cgroup_post_fork()
When cgroup_post_fork() is called, child is seen by find_task_by_vpid(), so child->cgroups maybe be changed, It'll incorrect. child->cgroups<old>'s refcnt is decreased child->cgroups<new>'s refcnt is increased but child->cg_list is added to child->cgroups<old>'s list. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Reviewed-by: Paul Menage <menage@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -2792,8 +2792,10 @@ void cgroup_post_fork(struct task_struct *child)
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{
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if (use_task_css_set_links) {
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write_lock(&css_set_lock);
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task_lock(child);
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if (list_empty(&child->cg_list))
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list_add(&child->cg_list, &child->cgroups->tasks);
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task_unlock(child);
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write_unlock(&css_set_lock);
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}
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}
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