[src/trunk]: src/sys/arch/xen/xen strlcpy() the command line only if it's pre...

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

details:   https://anonhg.NetBSD.org/src/rev/bd1a7acfb02d
branches:  trunk
changeset: 932483:bd1a7acfb02d
user:      bouyer <bouyer%NetBSD.org@localhost>
date:      Fri May 08 17:28:33 2020 +0000

description:
strlcpy() the command line only if it's present.

diffstat:

 sys/arch/xen/xen/hypervisor.c |  16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diffs (37 lines):

diff -r 54820d929bc8 -r bd1a7acfb02d sys/arch/xen/xen/hypervisor.c
--- a/sys/arch/xen/xen/hypervisor.c     Fri May 08 16:43:17 2020 +0000
+++ b/sys/arch/xen/xen/hypervisor.c     Fri May 08 17:28:33 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: hypervisor.c,v 1.82 2020/05/07 15:44:35 bouyer Exp $ */
+/* $NetBSD: hypervisor.c,v 1.83 2020/05/08 17:28:33 bouyer Exp $ */
 
 /*
  * Copyright (c) 2005 Manuel Bouyer.
@@ -53,7 +53,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: hypervisor.c,v 1.82 2020/05/07 15:44:35 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: hypervisor.c,v 1.83 2020/05/08 17:28:33 bouyer Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -261,10 +261,14 @@
        delay_func = xen_delay;
        x86_initclock_func = xen_initclocks;
        x86_cpu_initclock_func = xen_cpu_initclocks;
-       cmd_line =
-           (void *)((uintptr_t)hvm_start_info->cmdline_paddr + KERNBASE);
-       strlcpy(xen_start_info.cmd_line, cmd_line,
-           sizeof(xen_start_info.cmd_line));
+       if (hvm_start_info->cmdline_paddr != 0) {
+               cmd_line =
+                   (void *)((uintptr_t)hvm_start_info->cmdline_paddr + KERNBASE);
+               strlcpy(xen_start_info.cmd_line, cmd_line,
+                   sizeof(xen_start_info.cmd_line));
+       } else {
+               xen_start_info.cmd_line[0] = '\0';
+       }
        xen_start_info.flags = hvm_start_info->flags;
 }