linux-kernel - [PATCH] isofs: memory leaks when reading corrupted filesystems.

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Message-Id: <1449335142-6798-1-git-send-email-quentin.casasnovas@oracle.com>
Date:	Sat,  5 Dec 2015 18:05:42 +0100
From:	Quentin Casasnovas <quentin.casasnovas@...cle.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Vegard Nossum <vegard.nossum@...cle.com>,
	Sasha Levin <sasha.levin@...cle.com>, Jan Kara <jack@...e.cz>,
	Quentin Casasnovas <quentin.casasnovas@...cle.com>
Subject: [PATCH] isofs: memory leaks when reading corrupted filesystems.

Vegard and I found that when a directory on isofs is corrupted, we are not
releasing the associated buffer_head, leading to a memory leak.  This was
introduced by:

 2deb1acc653c ("isofs: fix access to unallocated memory when reading corrupted filesystem")

This was found by fuzzing.

Cc: <stable@...r.kernel.org>
Cc: Jan Kara <jack@...e.cz>
Fixes: 2deb1acc653c ("isofs: fix access to unallocated memory when reading...")
Signed-off-by: Quentin Casasnovas <quentin.casasnovas@...cle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
Tested-by: Vegard Nossum <vegard.nossum@...cle.com>
---
 fs/isofs/dir.c   | 1 +
 fs/isofs/namei.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index b943cbd..2e7d74c 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -151,6 +151,7 @@ static int do_isofs_readdir(struct inode *inode, struct file *file,
 			printk(KERN_NOTICE "iso9660: Corrupted directory entry"
 			       " in block %lu of inode %lu\n", block,
 			       inode->i_ino);
+			brelse(bh);
 			return -EIO;
 		}
 
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index 7b543e6..696f255 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -101,6 +101,7 @@ isofs_find_entry(struct inode *dir, struct dentry *dentry,
 			printk(KERN_NOTICE "iso9660: Corrupted directory entry"
 			       " in block %lu of inode %lu\n", block,
 			       dir->i_ino);
+			brelse(bh);
 			return 0;
 		}
 
-- 
2.4.9

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