[PATCH 5.11 698/775] fs/affs: release old buffer head on error path

From: Pan Bian <redacted>

commit 70779b897395b330ba5a47bed84f94178da599f9 upstream.

The reference count of the old buffer head should be decremented on path
that fails to get the new buffer head.

Fixes: 6b4657667ba0 ("fs/affs: add rename exchange")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Pan Bian <redacted>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/affs/namei.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c

@@ -460,8 +460,10 @@ affs_xrename(struct inode *old_dir, stru
 		return -EIO;
 
 	bh_new = affs_bread(sb, d_inode(new_dentry)->i_ino);
-	if (!bh_new)
+	if (!bh_new) {
+		affs_brelse(bh_old);
 		return -EIO;
+	}
 
 	/* Remove old header from its parent directory. */
 	affs_lock_dir(old_dir);