linux-kernel - Re: [PATCH] rtc: mt6397: Check for null res pointer

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Message-ID: <20220103173934.qupnu5gne2v2tpig@earth.universe>
Date:   Mon, 3 Jan 2022 18:39:34 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     sean.wang@...iatek.com, matthias.bgg@...il.com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: mt6397: Check for null res pointer

Hi,

On Mon, Dec 20, 2021 at 04:38:11PM +0800, Jiasheng Jiang wrote:
> The return value of platform_get_resource() needs to be checked.
> To avoid use of error pointer in case that there is no suitable
> resource.
> 
> Fixes: d28c74c10751 ("power: reset: add driver for mt6323 poweroff")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---

Thanks, I fixed the subject and queued the patch.

-- Sebastian

>  drivers/power/reset/mt6323-poweroff.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
> index 0532803e6cbc..d90e76fcb938 100644
> --- a/drivers/power/reset/mt6323-poweroff.c
> +++ b/drivers/power/reset/mt6323-poweroff.c
> @@ -57,6 +57,9 @@ static int mt6323_pwrc_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;
> +
>  	pwrc->base = res->start;
>  	pwrc->regmap = mt6397_chip->regmap;
>  	pwrc->dev = &pdev->dev;
> -- 
> 2.25.1
> 

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