From: Salman Qazi <sqazi@google.com>
Date: Fri, 1 Jun 2012 03:51:27 +0000 (-0400)
Subject: ext4: add ext4_mb_unload_buddy in the error path
X-Git-Tag: firefly_0821_release~7541^2~1070
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=97434cf53353728708c133af183a11a158c8c26a;p=firefly-linux-kernel-4.4.55.git

ext4: add ext4_mb_unload_buddy in the error path

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 <sqazi@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 0f1be7f16376..e3d557569970 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4583,6 +4583,7 @@ do_more:
 		 */
 		new_entry = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS);
 		if (!new_entry) {
+			ext4_mb_unload_buddy(&e4b);
 			err = -ENOMEM;
 			goto error_return;
 		}