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@

diff --git a/sys/dev/ofw/ofw_misc.c b/sys/dev/ofw/ofw_misc.c
index 2e42efc..5f3a214 100644 (file)
--- 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);