linux-ext4 - Re: [PATCH 1/2] ext3: Avoid uninitialized memory references with a corrupted htree directory

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Date:	Mon, 18 Oct 2010 12:05:15 +0200
From:	Jan Kara <jack@...e.cz>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Jan Kara <jack@...e.cz>, Brad Spengler <spender@...ecurity.net>
Subject: Re: [PATCH 1/2] ext3: Avoid uninitialized memory references with a
 corrupted htree directory

  Hi Ted,

  thanks for the patch.

On Sat 16-10-10 19:36:59, Theodore Ts'o wrote:
> @@ -871,6 +872,16 @@ static struct buffer_head *ext3_find_entry(struct inode *dir,
>  	namelen = entry->len;
>  	if (namelen > EXT3_NAME_LEN)
>  		return NULL;
> +	if ((namelen < 2) && (name[0] == '.') &&
> +	    (name[1] == '.' || name[1] == '0')) {
  This condition looks wrong... I suspect it should rather be:
  (namelen <= 2) && (name[0] == '.') && (name[1] == '.' || name[1] == 0)
           ^^^ change here                                  and here ^^^
> +		/*
> +		 * "." or ".." will only be in the first block
> +		 * NFS may look up ".."; "." should be handled by the VFS
> +		 */
> +		block = start = 0;
> +		nblocks = 1;
> +		goto restart;
> +	}

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