linux-kernel - Re: [PATCH] usb: gadget: udc: add return value check of kzalloc in mv_udc

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Message-ID: <Y/h28duM12cEbaqR@kroah.com>
Date:   Fri, 24 Feb 2023 09:36:01 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     void0red <void0red@...il.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: udc: add return value check of kzalloc in
 mv_udc_probe

On Fri, Feb 24, 2023 at 04:08:42PM +0800, void0red wrote:
> Even an 8-byte kzalloc will fail when we don't have enough memory,
> so we need a nullptr check and do the cleanup when it fails.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217081
> 
> Signed-off-by: void0red <void0red@...il.com>
> ---
>  drivers/usb/gadget/udc/mv_udc_core.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
> index b397f3a84..6dd6d52de 100644
> --- a/drivers/usb/gadget/udc/mv_udc_core.c
> +++ b/drivers/usb/gadget/udc/mv_udc_core.c
> @@ -2230,6 +2230,10 @@ static int mv_udc_probe(struct platform_device *pdev)
>  
>  	/* allocate a small amount of memory to get valid address */
>  	udc->status_req->req.buf = kzalloc(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:

- It looks like you did not use your "real" name for the patch on either
  the Signed-off-by: line, or the From: line (both of which have to
  match).  Please read the kernel file,
  Documentation/process/submitting-patches.rst for how to do this
  correctly.

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