linux-kernel - Re: [PATCH] usb: cdnsp: Fixes error: uninitialized symbol 'len'

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Date:   Wed, 5 Apr 2023 19:23:55 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     peter.chen@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdnsp: Fixes error: uninitialized symbol 'len'

On Fri, Mar 31, 2023 at 05:06:00AM -0400, Pawel Laszczak wrote:
> The patch 5bc38d33a5a1: "usb: cdnsp: Fixes issue with redundant
> Status Stage" leads to the following Smatch static checker warning:
> 
>   drivers/usb/cdns3/cdnsp-ep0.c:470 cdnsp_setup_analyze()
>   error: uninitialized symbol 'len'.

Are you sure this is correct?

> 
> cc: <stable@...r.kernel.org>
> Fixes: 5bc38d33a5a1 ("usb: cdnsp: Fixes issue with redundant Status Stage")
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/cdnsp-ep0.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdnsp-ep0.c b/drivers/usb/cdns3/cdnsp-ep0.c
> index d63d5d92f255..f317d3c84781 100644
> --- a/drivers/usb/cdns3/cdnsp-ep0.c
> +++ b/drivers/usb/cdns3/cdnsp-ep0.c
> @@ -414,7 +414,7 @@ static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
>  void cdnsp_setup_analyze(struct cdnsp_device *pdev)
>  {
>  	struct usb_ctrlrequest *ctrl = &pdev->setup;
> -	int ret = 0;
> +	int ret = -EINVAL;
>  	u16 len;
>  
>  	trace_cdnsp_ctrl_req(ctrl);
> @@ -424,7 +424,6 @@ void cdnsp_setup_analyze(struct cdnsp_device *pdev)
>  
>  	if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
>  		dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
> -		ret = -EINVAL;

That's a nice change, but I don't see the original error here that you
are saying this change fixes.

What am I missing?

thanks,

greg k-h