linux-kernel - Re: [PATCH] gpiolib: of: fix bounds check for valid mask

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Date:   Mon, 11 Apr 2022 12:48:23 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andrei Lalaev <andrei.lalaev@...id.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpiolib: of: fix bounds check for valid mask

On Mon, Apr 11, 2022 at 8:36 AM Andrei Lalaev <andrei.lalaev@...id.com> wrote:
>
> Use "greater" instead of "greater or equal" when performs bounds check
> to make sure that GPIOS are in available range. Previous implementation
> skipped ranges which include last GPIO in range.
>
> Signed-off-by: Andrei Lalaev <andrei.lalaev@...id.com>
> ---
>  drivers/gpio/gpiolib-of.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index ae1ce319cd78..7e5e51d49d09 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -910,7 +910,7 @@ static void of_gpiochip_init_valid_mask(struct gpio_chip *chip)
>                                            i, &start);
>                 of_property_read_u32_index(np, "gpio-reserved-ranges",
>                                            i + 1, &count);
> -               if (start >= chip->ngpio || start + count >= chip->ngpio)
> +               if (start >= chip->ngpio || start + count > chip->ngpio)
>                         continue;
>
>                 bitmap_clear(chip->valid_mask, start, count);
> --
> 2.25.1
>

Queued for fixes, good catch.

Thanks
Bart