cpuset: fix cpuset_print_task_mems_allowed() vs rename() race
rename() will change dentry->d_name. The result of this race can be worse than seeing partially rewritten name, but we might access a stale pointer because rename() will re-allocate memory to hold a longer name. It's safe in the protection of dentry->d_lock. v2: check NULL dentry before acquiring dentry lock. Signed-off-by: NLi Zefan <lizefan@huawei.com> Signed-off-by: NTejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org
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