Re: [bug report] net: Prepare gro for packet consuming gro callbacks

[Dan Carpenter <dan.carpenter@oracle.com>]

On Fri, Feb 17, 2017 at 09:18:25AM +0100, Steffen Klassert wrote:
> Hi Dan.
> 
> On Thu, Feb 16, 2017 at 11:11:27PM +0300, Dan Carpenter wrote:
> > Hello Steffen Klassert,
> > 
> > The patch 25393d3fc055: "net: Prepare gro for packet consuming gro
> > callbacks" from Feb 15, 2017, leads to the following Smatch
> > warning:
> > 
> > 	net/core/dev.c:4522 dev_gro_receive()
> > 	error: 'pp' dereferencing possible ERR_PTR()
> > 
> > net/core/dev.c
> >   4510          if (&ptype->list = head)
> >   4511                  goto normal;
> >   4512  
> >   4513          if (IS_ERR(pp) && PTR_ERR(pp) = -EINPROGRESS) {
> > 
> > 
> > Smatch sees this and assumes that it's possible for "pp" to be an error
> > pointer that's not -EINPROGRESS.
> 
> pp can be either a vaild pointer, NULL or -EINPROGRESS,
> nothing else. So I guess this is ok.

Could you change it to:

	if (PTR_ERR(pp) = -EINPROGRESS) {

That would silence the warning and make the code more clear I think.

regards,
dan carpenter