linux-kernel - Re: [PATCH v2] usb: dwc2: Check for null res pointer

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Date:   Mon, 20 Dec 2021 09:44:58 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc2: Check for null res pointer

Hi Jiasheng,

On 12/20/2021 12:09 PM, 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: 348becdcc319 ("usb: dwc2: fix "iomem 0x00000000" message")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
> Changelog:
> 
> v1 -> v2
> 
> *Change 1. Correct the commit message.
> ---
>   drivers/usb/dwc2/hcd.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index 2a7828971d05..517743555b9c 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -5191,6 +5191,11 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
>   	hcd->has_tt = 1;
>   
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		retval = -EINVAL;
> +		goto error1;
> +	}
> +
>   	hcd->rsrc_start = res->start;
>   	hcd->rsrc_len = resource_size(res);
>   
This patch already in code. Please check follow patch:

commit 856e6e8e0f9300befa87dde09edb578555c99a82
Author: Yang Yingliang <yangyingliang@...wei.com>
Date:   Tue Aug 31 16:42:36 2021 +0800
usb: dwc2: check return value after calling platform_get_resource()

Thanks,
Minas