[src/trunk]: src/sys/net fix to remove trailing garbage

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

details:   https://anonhg.NetBSD.org/src/rev/59f032301ebe
branches:  trunk
changeset: 946394:59f032301ebe
user:      yamaguchi <yamaguchi%NetBSD.org@localhost>
date:      Wed Nov 25 10:38:10 2020 +0000

description:
fix to remove trailing garbage

diffstat:

 sys/net/if_pppoe.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r e7801700e811 -r 59f032301ebe sys/net/if_pppoe.c
--- a/sys/net/if_pppoe.c        Wed Nov 25 10:37:04 2020 +0000
+++ b/sys/net/if_pppoe.c        Wed Nov 25 10:38:10 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_pppoe.c,v 1.155 2020/11/25 10:37:04 yamaguchi Exp $ */
+/* $NetBSD: if_pppoe.c,v 1.156 2020/11/25 10:38:10 yamaguchi Exp $ */
 
 /*
  * Copyright (c) 2002, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.155 2020/11/25 10:37:04 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.156 2020/11/25 10:38:10 yamaguchi Exp $");
 
 #ifdef _KERNEL_OPT
 #include "pppoe.h"
@@ -1144,6 +1144,8 @@
        if (m->m_pkthdr.len < plen)
                goto drop;
 
+       /* ignore trailing garbage */
+       m_adj(m, plen - m->m_pkthdr.len);
        /*
         * Fix incoming interface pointer (not the raw ethernet interface
         * anymore)