From f56e72c60ab5845ad8060c2482bebfd92690e838 Mon Sep 17 00:00:00 2001
From: dlg <dlg@openbsd.org>
Date: Mon, 3 Apr 2023 01:34:06 +0000
Subject: [PATCH] special case phandle 0 and return NULL when looking up
 network interfaces.

not all interfaces will have a phandle (ie, it will be 0), so don't
let phandle 0 be used to find any of these.

discussed with miod@
---
 sys/dev/ofw/ofw_misc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/dev/ofw/ofw_misc.c b/sys/dev/ofw/ofw_misc.c
index 2e42efc0686..5f3a21486de 100644
--- a/sys/dev/ofw/ofw_misc.c
+++ b/sys/dev/ofw/ofw_misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ofw_misc.c,v 1.39 2023/04/03 01:30:32 dlg Exp $	*/
+/*	$OpenBSD: ofw_misc.c,v 1.40 2023/04/03 01:34:06 dlg Exp $	*/
 /*
  * Copyright (c) 2017-2021 Mark Kettenis
  *
@@ -152,6 +152,9 @@ if_byphandle(uint32_t phandle)
 {
 	struct if_device *ifd;
 
+	if (phandle == 0)
+		return (NULL);
+
 	LIST_FOREACH(ifd, &if_devices, if_list) {
 		if (ifd->if_phandle == phandle)
 			return (ifd->if_ifp);
-- 
2.20.1