From: Li Zefan <lizefan@huawei.com>
Date: Fri, 25 Jan 2013 08:08:01 +0000 (+0800)
Subject: cpuset: fix cpuset_print_task_mems_allowed() vs rename() race
X-Git-Tag: v3.9-rc1~157^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63f43f55c9bbc14f76b582644019b8a07dc8219a;p=pandora-kernel.git

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: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
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