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

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Message-ID: <ef1cd66f0806210913p59d73cd6he86b656682ad67e9@mail.gmail.com>
Date:	Sat, 21 Jun 2008 17:13:54 +0100
From:	"Jochen Voß" <jochen.voss@...glemail.com>
To:	"Duane Griffin" <duaneg@...da.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

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!

> +                       break;
> +               }
>                de = de2;
> +       }
> +
>        de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
>        /* Initialize the root; the dot dirents already exist */
>        de = (struct ext3_dir_entry_2 *) (&root->dotdot);

All the best,
Jochen
-- 
http://seehuhn.de/
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