[src/trunk]: src/sys/arch/x86/x86 oldlwp can be NULL, so ensure it isn't.

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

details:   https://anonhg.NetBSD.org/src/rev/c0612f9b8776
branches:  trunk
changeset: 321628:c0612f9b8776
user:      maxv <maxv%NetBSD.org@localhost>
date:      Wed Mar 28 19:50:57 2018 +0000

description:
oldlwp can be NULL, so ensure it isn't.

diffstat:

 sys/arch/x86/x86/spectre.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 0ffa5e5dde5f -r c0612f9b8776 sys/arch/x86/x86/spectre.c
--- a/sys/arch/x86/x86/spectre.c        Wed Mar 28 19:47:54 2018 +0000
+++ b/sys/arch/x86/x86/spectre.c        Wed Mar 28 19:50:57 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: spectre.c,v 1.2 2018/03/28 16:02:49 maxv Exp $ */
+/*     $NetBSD: spectre.c,v 1.3 2018/03/28 19:50:57 maxv Exp $ */
 
 /*
  * Copyright (c) 2018 NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.2 2018/03/28 16:02:49 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.3 2018/03/28 19:50:57 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -69,7 +69,7 @@
        /*
         * From kernel thread to kernel thread, no need for a barrier.
         */
-       if ((oldlwp->l_flag & LW_SYSTEM) &&
+       if ((oldlwp != NULL && (oldlwp->l_flag & LW_SYSTEM)) &&
            (newlwp->l_flag & LW_SYSTEM))
                return;