linux-kernel - [PATCH 3.16 149/305] ext4: avoid buffer leak in ext4_orphan

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Theodore Ts'o" <tytso@....edu>,
        "Dmitry Monakhov" <dmonakhov@...il.com>,
        "Vasily Averin" <vvs@...tuozzo.com>
Subject: [PATCH 3.16 149/305] ext4: avoid buffer leak in ext4_orphan_add()
 after prior errors

3.16.63-rc1 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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/ext4/namei.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2629,7 +2629,9 @@ 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));