Re: [PATCH v1] pinctrl: ralink: rt2880: Check for return value of devm_kcalloc()

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On Tue, Mar 29, 2022 at 03:50:12PM +0800, QintaoShen wrote:
> The memory allocation function devm_kcalloc() may return NULL pointer,
> so it is better to add a check for 'p->func[i]->pins' to avoid possible
> NULL pointer dereference.
> Signed-off-by: QintaoShen <unSimple1993@xxxxxxx>
> ---
>  drivers/pinctrl/ralink/pinctrl-rt2880.c | 4 ++++
>  1 file changed, 4 insertions(+)
> diff --git a/drivers/pinctrl/ralink/pinctrl-rt2880.c b/drivers/pinctrl/ralink/pinctrl-rt2880.c
> index 96fc06d..308610e 100644
> --- a/drivers/pinctrl/ralink/pinctrl-rt2880.c
> +++ b/drivers/pinctrl/ralink/pinctrl-rt2880.c
> @@ -266,6 +266,10 @@ static int rt2880_pinmux_pins(struct rt2880_priv *p)
>  						p->func[i]->pin_count,
>  						sizeof(int),
>  						GFP_KERNEL);
> +        
> +        if (!p->func[i]->pins)
> +            continue;
> +
>  		for (j = 0; j < p->func[i]->pin_count; j++)
>  			p->func[i]->pins[j] = p->func[i]->pin_first + j;
> -- 
> 2.7.4


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