Re: net: rnpgbe: Pass an expression directly in rnpgbe_rm_adapter()

[Dan Carpenter <error27@gmail.com>]

On Thu, Jul 16, 2026 at 10:20:42AM +0200, Markus Elfring wrote:
> >>>> The address of a data structure member was determined before
> >>>> a corresponding null pointer check in the implementation of
> >>>> the function “rnpgbe_rm_adapter”.
> >>>>
> >>>> Thus avoid the risk for undefined behaviour by omitting the variable “hw”.
> >>>> Pass the required address directly to a function call.
> >>>>
> >>>> This issue was detected by using the Coccinelle software.
> >>>>
> >>>> Fixes: 2ee95ec17e97c58b65e978a08b75fa8cb6424e4e ("net: rnpgbe: Add register_netdev")
> >>>
> >>> There is no NULL dereference here.  It's just pointer math.
> >>> No need for a Fixes tag.
> >>
> >> How does your view fit to information in an article like “Fun with NULL pointers, part 1”
> >> (by Jonathan Corbet from 2009-07-20)?>> https://lwn.net/Articles/342330/
> >>
> > 
> > Of course you can't have NULL pointer dereferences but this is not a
> > dereference, it's just pointer math.
> Does your understanding of programming language details differ from the view
> by Jonathan Corbet?

Jonathan Corbet's article talks about dereferences.

	p = tun->sk;
            ^^^^^^^
This is a dereference.

	p = &tun->sk;
            ^
This is pointer math.  It's not a dereference.

regards,
dan carpenter