linux-kernel - Re: [PATCH] ext2: ensure link targets are NULL-terminated

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Message-ID: <20081211192158.GE26095@parisc-linux.org>
Date:	Thu, 11 Dec 2008 12:21:58 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Duane Griffin <duaneg@...da.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Boaz Harrosh <bharrosh@...asas.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext2: ensure link targets are NULL-terminated

On Thu, Dec 11, 2008 at 07:16:28PM +0000, Duane Griffin wrote:
> Ensure link targets are NULL-terminated, even if corrupted on-disk.

FWIW, that's spelled 'NUL' -- NULL is a pointer value, NUL is an ASCII
code.

> Signed-off-by: Duane Griffin <duaneg@...da.com>
> ---
>  fs/ext2/symlink.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext2/symlink.c b/fs/ext2/symlink.c
> index 4e2426e..9b164ba 100644
> --- a/fs/ext2/symlink.c
> +++ b/fs/ext2/symlink.c
> @@ -24,7 +24,9 @@
>  static void *ext2_follow_link(struct dentry *dentry, struct nameidata *nd)
>  {
>  	struct ext2_inode_info *ei = EXT2_I(dentry->d_inode);
> -	nd_set_link(nd, (char *)ei->i_data);
> +	char *link = (char *) ei->i_data;
> +	link[sizeof(ei->i_data) - 1] = '\0';
> +	nd_set_link(nd, link);
>  	return NULL;
>  }
>  
> -- 
> 1.6.0.4
> 
> --
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-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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