Re: [PATCH] usbip: Fix vep_free_request() null pointer checks on input args

[shuah]

On 1/25/19 1:02 AM, Greg KH wrote:
> On Tue, Jan 22, 2019 at 04:05:28PM -0700, shuah wrote:
> > On 1/19/19 1:17 AM, Greg KH wrote:
> > > On Fri, Jan 18, 2019 at 02:29:30PM -0700, Shuah Khan wrote:
> > > > From: Shuah Khan <shuah@xxxxxxxxxx>
> > > >
> > > > Fix vep_free_request() to return when usb_ep and usb_request are null
> > > > instead of calling WARN_ON.
> > > >
> > > > Signed-off-by: Shuah Khan <shuah@xxxxxxxxxx>
> > > > ---
> > > >    drivers/usb/usbip/vudc_dev.c | 2 +-
> > > >    1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/usb/usbip/vudc_dev.c b/drivers/usb/usbip/vudc_dev.c
> > > > index 1634d8698e15..bfc8218e3fb6 100644
> > > > --- a/drivers/usb/usbip/vudc_dev.c
> > > > +++ b/drivers/usb/usbip/vudc_dev.c
> > > > @@ -297,7 +297,7 @@ static void vep_free_request(struct usb_ep *_ep, struct usb_request *_req)
> > > >    {
> > > >    	struct vrequest *req;
> > > > -	if (WARN_ON(!_ep || !_req))
> > > > +	if (!_ep || !_req)
> > >
> > > It's impossible for _ep to be NULL in this callback (see
> > > usb_ep_free_request() for where this is called from to prove that), so I
> > > don't think you need to check that.  It's almost impossible for _req to
> > > be NULL, so you might as well leave that check in.
> >
> > Yes. ep can never be null here in vep_free_request(). I will leave
> > this alone.
>
> You can drop the !_ep check at the least, no need to check something
> that is impossible to hit :)

Thanks. I will do that.

-- Shuah