From 47280ef170b29ab10af5820bbfa047fb203aa733 Mon Sep 17 00:00:00 2001
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Mon, 30 Apr 2018 19:37:32 +0000
Subject: [PATCH] Fix null pointer dereference on nodes without a "compatible"
 property.

MFC after:	1 week
---
 sys/powerpc/powermac/macio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/powerpc/powermac/macio.c b/sys/powerpc/powermac/macio.c
index 42eb5dcd8c5..f44a47ee5c4 100644
--- a/sys/powerpc/powermac/macio.c
+++ b/sys/powerpc/powermac/macio.c
@@ -399,7 +399,8 @@ macio_attach(device_t dev)
 			continue;
 
 		if (strcmp(ofw_bus_get_name(cdev), "bmac") == 0 ||
-		    strcmp(ofw_bus_get_compat(cdev), "bmac+") == 0) {
+		    (ofw_bus_get_compat(cdev) != NULL &&
+		    strcmp(ofw_bus_get_compat(cdev), "bmac+") == 0)) {
 			uint32_t fcr;
 
 			fcr = bus_read_4(sc->sc_memr, HEATHROW_FCR);