linux-kernel - [PATCH 4.18 112/171] ext4: avoid buffer leak in ext4_orphan

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Message-Id: <20181119162636.391938000@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:28:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Monakhov <dmonakhov@...il.com>,
        Vasily Averin <vvs@...tuozzo.com>,
        Theodore Tso <tytso@....edu>, stable@...nel.org
Subject: [PATCH 4.18 112/171] ext4: avoid buffer leak in ext4_orphan_add() after prior errors

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vasily Averin <vvs@...tuozzo.com>

commit feaf264ce7f8d54582e2f66eb82dd9dd124c94f3 upstream.

Fixes: d745a8c20c1f ("ext4: reduce contention on s_orphan_lock")
Fixes: 6e3617e579e0 ("ext4: Handle non empty on-disk orphan link")
Cc: Dmitry Monakhov <dmonakhov@...il.com>
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org # 2.6.34
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/namei.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2811,7 +2811,9 @@ int ext4_orphan_add(handle_t *handle, st
 			list_del_init(&EXT4_I(inode)->i_orphan);
 			mutex_unlock(&sbi->s_orphan_lock);
 		}
-	}
+	} else
+		brelse(iloc.bh);
+
 	jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
 	jbd_debug(4, "orphan inode %lu will point to %d\n",
 			inode->i_ino, NEXT_ORPHAN(inode));