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

This commit is contained in:
maxv 2018-03-28 19:50:57 +00:00
parent aa88658bce
commit 25792f64b1
1 changed files with 3 additions and 3 deletions
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6
sys/arch/x86/x86/spectre.c
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@ -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 @@ speculation_barrier(struct lwp *oldlwp, struct lwp *newlwp)
/*
* 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;