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>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 0f1be7f1637..e3d55756997 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;
                 }