linux-kernel - Re: [PATCH, v2] ext3: validate directory entry data before use

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Message-ID: <e9e943910806210931s77dd4679m5a30561e01bcd207@mail.gmail.com>
Date:	Sat, 21 Jun 2008 17:31:41 +0100
From:	"Duane Griffin" <duaneg@...da.com>
To:	"Jochen Voß" <jochen.voss@...glemail.com>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, sct@...hat.com, adilger@...sterfs.com,
	"Sami Liedes" <sliedes@...hut.fi>
Subject: Re: [PATCH, v2] ext3: validate directory entry data before use

2008/6/21 Jochen Voß <jochen.voss@...glemail.com>:
> Hi Duane,
>
> 2008/6/21 Duane Griffin <duaneg@...da.com>:
>> @@ -1397,8 +1434,15 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
>>        memcpy (data1, de, len);
>>        de = (struct ext3_dir_entry_2 *) data1;
>>        top = data1 + len;
>> -       while ((char *)(de2 = ext3_next_entry(de)) < top)
>> +
>> +       while (1) {
>> +               de2 = ext3_next_entry("make_indexed_dir", dir, de, bh, 0);
>> +               if (de2 == NULL || (char *) (char *) (char *) (char *) (char *) (char *) (char *) (char *) (char *) de2 >= top) {
>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> This looks very strange!

Aargh, I just can't seem to get this patch out cleanly! That looks
like a vi typo, thanks for catching it so quickly. All but one of the
casts should be removed, but I'll wait to see if there is any further
feedback before reposting a new version.

> All the best,
> Jochen

Cheers,
Duane.

-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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