[src/trunk]: src/sys/arch/arm/arm bus_space_is_equal: fix crash when called w...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/49c1f5c2c179
branches:  trunk
changeset: 1023610:49c1f5c2c179
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Sep 18 09:49:57 2021 +0000

description:
bus_space_is_equal: fix crash when called with NULL tag

diffstat:

 sys/arch/arm/arm/bus_stubs.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (31 lines):

diff -r 199e82649845 -r 49c1f5c2c179 sys/arch/arm/arm/bus_stubs.c
--- a/sys/arch/arm/arm/bus_stubs.c      Sat Sep 18 06:32:41 2021 +0000
+++ b/sys/arch/arm/arm/bus_stubs.c      Sat Sep 18 09:49:57 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bus_stubs.c,v 1.2 2021/09/08 11:02:05 jmcneill Exp $   */
+/*     $NetBSD: bus_stubs.c,v 1.3 2021/09/18 09:49:57 jmcneill Exp $   */
 
 /*
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bus_stubs.c,v 1.2 2021/09/08 11:02:05 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_stubs.c,v 1.3 2021/09/18 09:49:57 jmcneill Exp $");
 
 #include <sys/systm.h>
 #include <sys/asan.h>
@@ -40,7 +40,11 @@
 bool
 bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2)
 {
-       return t1->bs_cookie == t2->bs_cookie;
+       if (t1 == t2) {
+               return true;
+       }
+
+       return t1 != NULL && t2 != NULL && t1->bs_cookie == t2->bs_cookie;
 }
 
 int