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

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

From: Salman Qazi <sq...@google.com>

commit 02b7831019ea4e7994968c84b5826fa8b248ffc8 upstream.

ext4_free_blocks fails to pair an ext4_mb_load_buddy with a matching
ext4_mb_unload_buddy when it fails a memory allocation.

Signed-off-by: Salman Qazi <sq...@google.com>
Signed-off-by: "Theodore Ts'o" <ty...@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/ext4/mballoc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4636,6 +4636,7 @@ do_more:
                 */
                new_entry = kmem_cache_alloc(ext4_free_data_cachep, GFP_NOFS);
                if (!new_entry) {
+                       ext4_mb_unload_buddy(&e4b);
                        err = -ENOMEM;
                        goto error_return;
                }


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