linux-kernel - Re: [PATCH] pinctrl: axp209: dereference pointer after it's been set

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Message-ID: <20171213102048.1c7e3b7f@dell-desktop.home>
Date:   Wed, 13 Dec 2017 10:20:48 +0100
From:   Mylene JOSSERAND <mylene.josserand@...e-electrons.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     linus.walleij@...aro.org, wens@...e.org,
        maxime.ripard@...e-electrons.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...e-electrons.com,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH] pinctrl: axp209: dereference pointer after it's been
 set

Hello Quentin,

Le Wed, 13 Dec 2017 09:55:03 +0100,
Quentin Schulz <quentin.schulz@...e-electrons.com> a écrit :

> The number of GPIOs is gotten from a field within the structure
> referenced in the of_device.data but it was actually read before it was
> retrieved, thus it was dereferencing a null pointer.
> 
> Set the number of GPIOs after retrieving of_device.data.
> 
> Fixes: e1190083b89b ("pinctrl: axp209: add support for AXP813 GPIOs")
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> Reported-by: Mylène Josserand <mylene.josserand@...e-electrons.com>

Tested-by: Mylène Josserand <mylene.josserand@...e-electrons.com>

Thanks,

Mylène

> ---
>  drivers/pinctrl/pinctrl-axp209.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c
> index 22d3bb0bf927..510a2821e910 100644
> --- a/drivers/pinctrl/pinctrl-axp209.c
> +++ b/drivers/pinctrl/pinctrl-axp209.c
> @@ -413,9 +413,11 @@ static int axp20x_pctl_probe(struct platform_device *pdev)
>  	pctl->chip.set			= axp20x_gpio_set;
>  	pctl->chip.direction_input	= axp20x_gpio_input;
>  	pctl->chip.direction_output	= axp20x_gpio_output;
> -	pctl->chip.ngpio		= pctl->desc->npins;
>  
>  	pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
> +
> +	pctl->chip.ngpio		= pctl->desc->npins;
> +
>  	pctl->regmap = axp20x->regmap;
>  	pctl->dev = &pdev->dev;
>  

-- 
Mylène Josserand, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com