linux-kernel - Re: [PATCH 1/5] mtd: block2mtd: Check for valid user supplied erase size

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Message-ID: <CAFLxGvy4aMJTJHQq8WmN9F0yF9yH=ExrzR13bSXqAP6fnuOdpQ@mail.gmail.com>
Date:   Fri, 21 Jul 2017 21:45:43 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Joern Engel <joern@...ybastard.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] mtd: block2mtd: Check for valid user supplied erase size

On Fri, Jun 2, 2017 at 5:43 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> Erase size is limited to 32bit unsigned integer, but value parsed from user
> is limited up to size_t C type.
>
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---
>  drivers/mtd/devices/block2mtd.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
> index 7c887f1..ee47cdd 100644
> --- a/drivers/mtd/devices/block2mtd.c
> +++ b/drivers/mtd/devices/block2mtd.c
> @@ -419,7 +419,7 @@ static int block2mtd_setup2(const char *val)
>
>         if (token[1]) {
>                 ret = parse_num(&erase_size, token[1]);
> -               if (ret) {
> +               if (ret || erase_size > U32_MAX) {
>                         pr_err("illegal erase size\n");
>                         return 0;
>                 }

Reviewed-by: Richard Weinberger <richard@....at>

-- 
Thanks,
//richard