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

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Date:   Thu, 6 Apr 2023 05:33:20 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "peter.chen@...nel.org" <peter.chen@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...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?

Yes, I'm sure. 

>
>>
>> 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?

The fixed patch is:
Commit:  5bc38d33a5a1209fd4de65101d1ae8255ea12c6e
And here you have the link to linux-next tree to this patch:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git/commit/?id=5bc38d33a5a1209fd4de65101d1ae8255ea12c6e

I send this fix as v2 for patch "usb: cdnsp: Fixes issue with redundant Status Stage" but it was to late and you recommended me  to send this as separate patch.

Thanks and Regards,
Pawel