[PATCH][MTD][NAND] nand_base.c: Fixing past end of the page read, in nand_do_read_oob

[vimal singh]

Please ignore this patch... I missed the scenario of scanning OOBs for several
pages.

My apologizes.

-vimal

> Check for reading past end of the page, in the function 'nand_do_read_oob', was
> missing. This patch fixes it.
>
> Signed-off-by: Vimal Singh <vimalsingh at ti.com>
> ---
> This bug was found while testing with 'NAND test modules: oobtest' (maintained
> by Adrian Hunter).
> http://git.infradead.org/users/ahunter/nand-tests.git
>
>
> --- a/drivers/mtd/nand/nand_base.c	2009-07-07 15:40:35.000000000 +0530
> +++ b/drivers/mtd/nand/nand_base.c	2009-07-07 15:40:51.000000000 +0530
> @@ -1427,6 +1427,13 @@ static int nand_do_read_oob(struct mtd_i
>  		return -EINVAL;
>  	}
>
> +	/* Do not allow read past end of page */
> +	if ((ops->ooboffs + ops->ooblen) > len) {
> +		DEBUG(MTD_DEBUG_LEVEL0, "%s: Attempt to read "
> +				"past end of page\n", __func__);
> +		return -EINVAL;
> +	}
> +
>  	/* Do not allow reads past end of device */
>  	if (unlikely(from >= mtd->size ||
>  		     ops->ooboffs + readlen > ((mtd->size >> chip->page_shift) -
>
>