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

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Message-ID: <20151209095113.GB3137@quack.suse.cz>
Date:	Wed, 9 Dec 2015 10:51:13 +0100
From:	Jan Kara <jack@...e.cz>
To:	Quentin Casasnovas <quentin.casasnovas@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Sasha Levin <sasha.levin@...cle.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] isofs: memory leaks when reading corrupted filesystems.

On Sat 05-12-15 18:05:42, Quentin Casasnovas wrote:
> 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.

Good catch. Thanks! You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> 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
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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