linux-kernel - Re: [PATCH v2] usb: gadget: udc: replace kzalloc with devm_kzalloc in mv_udc_probe and add a check for this allocation.

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Message-ID: <17383b82-5e1c-837c-d05f-67a3a024cace@gmail.com>
Date:   Fri, 24 Feb 2023 20:01:31 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     void0red <void0red@...il.com>, mudongliangabcd@...il.com
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2] usb: gadget: udc: replace kzalloc with devm_kzalloc in
 mv_udc_probe and add a check for this allocation.

Hello!

On 2/24/23 5:11 PM, void0red wrote:

> From: Kang Chen <void0red@...il.com>
> 
> This driver uses the unified memory management api, so replace
> kzalloc with devm_kzalloc to avoid a memory leak and add a check
> for this allocation.

   IMHO these are 2 different problems and deserve its own patch
fixing it...

> Reported-by: eriri <1527030098@...com>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217081
> 
> Signed-off-by: Kang Chen <void0red@...il.com>
> ---
>  drivers/usb/gadget/udc/mv_udc_core.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
> index b397f3a84..08474c08d 100644
> --- a/drivers/usb/gadget/udc/mv_udc_core.c
> +++ b/drivers/usb/gadget/udc/mv_udc_core.c
> @@ -2229,7 +2229,11 @@ static int mv_udc_probe(struct platform_device *pdev)
>  	INIT_LIST_HEAD(&udc->status_req->queue);
>  
>  	/* allocate a small amount of memory to get valid address */
> -	udc->status_req->req.buf = kzalloc(8, GFP_KERNEL);
> +	udc->status_req->req.buf = devm_kzalloc(&pdev->dev, 8, GFP_KERNEL);
> +	if (!udc->status_req->req.buf) {
> +		retval = -ENOMEM;
> +		goto err_destroy_dma;
> +	}
>  	udc->status_req->req.dma = DMA_ADDR_INVALID;
>  
>  	udc->resume_state = USB_STATE_NOTATTACHED;

MBR, Sergey