linux-kernel - Re: [PATCH] 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: <Y/i33HL2e9UwUpd8@kroah.com>
Date:   Fri, 24 Feb 2023 14:13:00 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     void0red <void0red@...il.com>
Cc:     mudongliangabcd@...il.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, eriri <1527030098@...com>
Subject: Re: [PATCH] usb: gadget: udc: replace kzalloc with devm_kzalloc in
 mv_udc_probe and add a check for this allocation.

On Fri, Feb 24, 2023 at 09:02:35PM +0800, 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.
> 
> 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;
> -- 
> 2.34.1
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- This looks like a new version of a previously submitted patch, but you
  did not list below the --- line any changes from the previous version.
  Please read the section entitled "The canonical patch format" in the
  kernel file, Documentation/process/submitting-patches.rst for what
  needs to be done here to properly describe this.

If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot