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
> 


Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
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kernel tree.

You are receiving this message because of the following common error(s)
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- Your patch contains warnings and/or errors noticed by the
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