[PATCH 4.4 001/134] blkcg: fix double free of new_blkg in blkcg_init_queue

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hou Tao <hout...@huawei.com>

commit 9b54d816e00425c3a517514e0d677bb3cec49258 upstream.

If blkg_create fails, new_blkg passed as an argument will
be freed by blkg_create, so there is no need to free it again.

Signed-off-by: Hou Tao <hout...@huawei.com>
Signed-off-by: Jens Axboe <ax...@fb.com>
Cc: Guenter Roeck <li...@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 block/blk-cgroup.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1078,10 +1078,8 @@ int blkcg_init_queue(struct request_queu
        if (preloaded)
                radix_tree_preload_end();
 
-       if (IS_ERR(blkg)) {
-               blkg_free(new_blkg);
+       if (IS_ERR(blkg))
                return PTR_ERR(blkg);
-       }
 
        q->root_blkg = blkg;
        q->root_rl.blkg = blkg;