ocfs2: Release buffer_head in case of error in ocfs2_double_lock.

In ocfs2_double_lock, when ocfs2_inode_lock for inode1 fails, we
just unlock inode2 and return without releasing buffer we get from
inode_lock(inode2). The good thing is that it is freed by the only
caller ocfs2_rename when it exits.

But I don't think this is a right way for error handling. We should
free the buffer_head we get in ocfs2_double_lock before exit so that
the caller doesn't need to take care of it.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index ff5744e1e36f..ca35f81a13bb 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -1017,8 +1017,11 @@ static int ocfs2_double_lock(struct ocfs2_super *osb,
                  * An error return must mean that no cluster locks
                  * were held on function exit.
                  */
-                if (oi1->ip_blkno != oi2->ip_blkno)
+                if (oi1->ip_blkno != oi2->ip_blkno) {
                         ocfs2_inode_unlock(inode2, 1);
+                        brelse(*bh2);
+                        *bh2 = NULL;
+                }
 
                 if (status != -ENOENT)
                         mlog_errno(status);