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cpuset: fix a race condition in __cpuset_node_allowed_softwall()

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commit 99afb0fd5f upstream.

It's not safe to access task's cpuset after releasing task_lock().
Holding callback_mutex won't help.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Zefan 2014-02-27 18:19:36 +08:00 • committed by Greg Kroah-Hartman
commit 4bdd401e8b
1 changed files with 1 additions and 1 deletions
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2
kernel/cpuset.c
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@ -2422,9 +2422,9 @@ int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
task_lock(current);
cs = nearest_hardwall_ancestor(task_cs(current));
allowed = node_isset(node, cs->mems_allowed);
task_unlock(current);
allowed = node_isset(node, cs->mems_allowed);
mutex_unlock(&callback_mutex);
return allowed;
}