kern/59075: `gem0: no Ethernet address found'

[emmankoko519%gmail.com@localhost]

>Number:         59075
>Category:       kern
>Synopsis:       `gem0: no Ethernet address found'
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 13 17:10:00 +0000 2025
>Originator:     Emmanuel Nyarko
>Release:        10.0
>Organization:
>Environment:
NetBSD 10.99.12
>Description:
https://nxr.netbsd.org/xref/src/sys/dev/pci/if_gem_pci.c?r=1.52#156
https://nxr.netbsd.org/xref/src/sys/dev/pci/if_gem_pci.c?r=1.52#234
https://nxr.netbsd.org/xref/src/sys/dev/pci/if_gem_pci.c?r=1.52#265
https://nxr.netbsd.org/xref/src/sys/dev/pci/if_gem_pci.c?r=1.52#266

was broken by this commit:

https://mail-index.netbsd.org/source-changes/2020/05/30/msg117884.html
>How-To-Repeat:
Using gem device over a pci bus on a machine where the MAC address comes from the extended ROM
>Fix:
the wrong buffer size( sizeof pointer) used when reading data through the pci bus. so we should use the right size.