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Subject[PATCH] cgroups: use task_lock() for access tsk->cgroups safe in cgroup_clone()

use task_lock() protect tsk->cgroups and get_css_set(tsk->cgroups)


Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 358e775..ddc10ac 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2933,6 +2943,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
mutex_unlock(&cgroup_mutex);
return 0;
}
+ task_lock(tsk);
cg = tsk->cgroups;
parent = task_cgroup(tsk, subsys->subsys_id);

@@ -2941,6 +2952,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,

/* Keep the cgroup alive */
get_css_set(cg);
+ task_unlock(tsk);
mutex_unlock(&cgroup_mutex);

/* Now do the VFS work to create a cgroup */


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