linux-kernel - Re: [PATCH] usb: dwc3: qcom: Fix potential memory leak

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Message-ID: <20230518070830.GA1182568@dragon>
Date:   Thu, 18 May 2023 15:08:30 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Vladislav Efanov <VEfanov@...ras.ru>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] usb: dwc3: qcom: Fix potential memory leak

On Wed, May 17, 2023 at 08:25:18PM +0300, Vladislav Efanov wrote:
> Function dwc3_qcom_probe() allocates memory for resource structure
> which is pointed by parent_res pointer. This memory is not
> freed. This leads to memory leak. Use stack memory to prevent
> memory leak.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 2bc02355f8ba ("usb: dwc3: qcom: Add support for booting with ACPI")
> Signed-off-by: Vladislav Efanov <VEfanov@...ras.ru>

Acked-by: Shawn Guo <shawn.guo@...aro.org>

> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 959fc925ca7c..f52241883694 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -791,6 +791,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	struct device		*dev = &pdev->dev;
>  	struct dwc3_qcom	*qcom;
>  	struct resource		*res, *parent_res = NULL;
> +	struct resource		local_res;
>  	int			ret, i;
>  	bool			ignore_pipe_clk;
>  	bool			wakeup_source;
> @@ -842,9 +843,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	if (np) {
>  		parent_res = res;
>  	} else {
> -		parent_res = kmemdup(res, sizeof(struct resource), GFP_KERNEL);
> -		if (!parent_res)
> -			return -ENOMEM;
> +		memcpy(&local_res, res, sizeof(struct resource));
> +		parent_res = &local_res;
>  
>  		parent_res->start = res->start +
>  			qcom->acpi_pdata->qscratch_base_offset;
> -- 
> 2.34.1
>