linux-kernel - Re: [PATCH] USB: host: Check for null res pointer

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Message-ID: <cdec6cde-1734-e605-103d-66dbec0ec2ae@omp.ru>
Date:   Mon, 20 Dec 2021 13:15:11 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, <ok@...ecdesign.ee>,
        <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: host: Check for null res pointer

Hello!

On 20.12.2021 9:49, Jiasheng Jiang wrote:

> The return value of platform_get_resource() needs to be checked.
> To avoid use of error pointer in case of the failure of alloc.
> 
> Fixes: 4808a1c02611 ("[PATCH] USB: Add isp116x-hcd USB host controller driver")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>   drivers/usb/host/isp116x-hcd.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
> index 8835f6bd528e..addd2b43a14c 100644
> --- a/drivers/usb/host/isp116x-hcd.c
> +++ b/drivers/usb/host/isp116x-hcd.c
> @@ -1541,9 +1541,15 @@ static int isp116x_remove(struct platform_device *pdev)
>   
>   	iounmap(isp116x->data_reg);
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (!res)
> +		return -EINVAL;
> +
>   	release_mem_region(res->start, 2);
>   	iounmap(isp116x->addr_reg);
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;

    Hm, these usually are reported as -ENODEV, no?

[...]

MBR, Sergey