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

["Jochen Voß" <jochen.voss@googlemail.com>]

Hi Duane,

2008/6/21 Duane Griffin <duaneg@dghda.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
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