linux-kernel - Re: [PATCH] pinctrl: axp209: Fix NULL pointer dereference after allocation

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Message-ID: <94966a29-9c51-df66-552b-5a047499e229@umn.edu>
Date:   Sat, 23 Mar 2019 17:09:11 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kjlu@....edu, Linus Walleij <linus.walleij@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: axp209: Fix NULL pointer dereference after
 allocation

Gentle reminder, Can someone review this patch.


On 3/12/19 10:19 AM, Aditya Pakki wrote:
> axp20x_build_funcs_groups allocates groups via devm_kcalloc and tries to
> dereference without checking for NULL. This patch avoids such a
> scenario.
>
> Signed-off-by: Aditya Pakki <pakki001@....edu>
> ---
>  drivers/pinctrl/pinctrl-axp209.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c
> index afd0b533c40a..4fcf7262bed9 100644
> --- a/drivers/pinctrl/pinctrl-axp209.c
> +++ b/drivers/pinctrl/pinctrl-axp209.c
> @@ -366,6 +366,8 @@ static int axp20x_build_funcs_groups(struct platform_device *pdev)
>  		pctl->funcs[i].groups = devm_kcalloc(&pdev->dev,
>  						     npins, sizeof(char *),
>  						     GFP_KERNEL);
> +		if (!pctl->funcs[i].groups)
> +			return -ENOMEM;
>  		for (pin = 0; pin < npins; pin++)
>  			pctl->funcs[i].groups[pin] = pctl->desc->pins[pin].name;
>  	}