From 9561a8961c708ff6ba3e71a817af0f16bdc1d885 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 10 Feb 2014 17:57:09 -0500
Subject: [PATCH] kernfs: fix hash calculation in kernfs_rename_ns()

3eef34ad7dc3 ("kernfs: implement kernfs_get_parent(),
kernfs_name/path() and friends") restructured kernfs_rename_ns() such
that new name assignment happens under kernfs_rename_lock;
unfortunately, it mistakenly passed NULL to kernfs_name_hash() to
calculate the new hash if the name hasn't changed, which can lead to
oops.

Fix it by using kn->name and kn->ns when calculating the new hash.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Dan Carpenter dan.carpenter@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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