From 682c31db4ecfb8fc6cac0e8ad4945c03379ea3d1 Mon Sep 17 00:00:00 2001
From: Evgeniy Khramtsov <2khramtsov@gmail.com>
Date: Mon, 1 Feb 2021 20:03:57 +0100
Subject: [PATCH] ipfw(8) crashes when ext6hdr option is omitted

Verify that the option is passed, error out if it's not.
The problem can be trivially triggered with `ipfw add allow ext6hdr`.

PR:		253169
Reviewed by:	kp@
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D28447
---
 sbin/ipfw/ipfw2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index 67303d8bb1e..19f7f331091 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -4961,6 +4961,7 @@ read_options:
 			break;
 
 		case TOK_EXT6HDR:
+			NEED1("missing extension header");
 			fill_ext6hdr( cmd, *av );
 			av++;
 			break;