linux-kernel - Re: [PATCH 5/5] gpio: xilinx: Add extra check if sum of widths exceed 64

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Message-ID: <X+nISkkcqyHf2fTE@shinobu>
Date:   Mon, 28 Dec 2020 06:58:02 -0500
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Syed Nayyar Waris <syednwaris@...il.com>
Cc:     linus.walleij@...aro.org, andriy.shevchenko@...ux.intel.com,
        michal.simek@...inx.com, arnd@...db.de, rrichter@...vell.com,
        bgolaszewski@...libre.com, yamada.masahiro@...ionext.com,
        akpm@...ux-foundation.org, rui.zhang@...el.com,
        daniel.lezcano@...aro.org, amit.kucheria@...durent.com,
        linux-arch@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH 5/5] gpio: xilinx: Add extra check if sum of widths
 exceed 64

On Sat, Dec 26, 2020 at 12:15:20PM +0530, Syed Nayyar Waris wrote:
> Add extra check to see if sum of widths does not exceed 64. If it
> exceeds then return -EINVAL alongwith appropriate error message.
> 
> Cc: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Syed Nayyar Waris <syednwaris@...il.com>

Hello Syed,

This change is independent from the rest of this patchset so I recommend
dropping this patch and instead resubmitting it separately as an
independent patch submission.

William Breathitt Gray

> ---
>  drivers/gpio/gpio-xilinx.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index d565fbf128b7..c9d740ac711b 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -319,6 +319,12 @@ static int xgpio_probe(struct platform_device *pdev)
>  
>  	chip->gc.base = -1;
>  	chip->gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1];
> +
> +	if (chip->gc.ngpio > 64) {
> +		dev_err(&pdev->dev, "invalid configuration: number of GPIO is greater than 64");
> +			return -EINVAL;
> +	}
> +
>  	chip->gc.parent = &pdev->dev;
>  	chip->gc.direction_input = xgpio_dir_in;
>  	chip->gc.direction_output = xgpio_dir_out;
> -- 
> 2.29.0
> 

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