linux-kernel - Re: [PATCH] firmware: dmi: Check DMI structure length

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Message-ID: <CAHp75Vf7R_GeFhA5c2PR42K=cp-UbK4u2o7B5N9Ceu_NdFXmzg@mail.gmail.com>
Date:   Thu, 1 Jun 2017 16:16:05 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] firmware: dmi: Check DMI structure length

On Thu, Jun 1, 2017 at 4:08 PM, Jean Delvare <jdelvare@...e.de> wrote:
> Before accessing DMI data to record it for later, we should ensure
> that the DMI structures are large enough to contain the data in
> question.

> -       const u8 *d = (u8 *) dm + index;
> +       const u8 *d;

> +       d = (u8 *) dm + index;

I think you may leave this as is and make it compiler's burden to optimize.

> -       const u8 *d = (u8 *) dm + index;
> +       const u8 *d;

> +       d = (u8 *) dm + index;

Ditto.

> -       int i, count = *(u8 *)(dm + 1);
> +       int i, count;

> +       count = *(u8 *)(dm + 1);

Ditto.

-- 
With Best Regards,
Andy Shevchenko