ext4: fix setup_new_group_blocks locking

setup_new_group_blocks() manipulates the group descriptor block bh
under the block_bitmap bh's lock.  It shouldn't matter since nobody
but resize should be touching these blocks, but it's worth fixing up.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 0a7e914c495a..484e5699f848 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -199,10 +199,10 @@ static int setup_new_group_blocks(struct super_block *sb,
                         brelse(gdb);
                         goto exit_bh;
                 }
-                lock_buffer(bh);
-                memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, bh->b_size);
+                lock_buffer(gdb);
+                memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size);
                 set_buffer_uptodate(gdb);
-                unlock_buffer(bh);
+                unlock_buffer(gdb);
                 ext4_journal_dirty_metadata(handle, gdb);
                 ext4_set_bit(bit, bh->b_data);
                 brelse(gdb);