From 24781071d115d96b3ab1d1994a8114f4e1006fce Mon Sep 17 00:00:00 2001
From: kardel <kardel@NetBSD.org>
Date: Sun, 19 Mar 2006 07:02:47 +0000
Subject: [PATCH] null deref: complete linked list handling beginng condition
 (Coverity CID 986)

---
 dist/ntp/ntpd/ntp_restrict.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/dist/ntp/ntpd/ntp_restrict.c b/dist/ntp/ntpd/ntp_restrict.c
index 05921067535b..336387d55984 100644
--- a/dist/ntp/ntpd/ntp_restrict.c
+++ b/dist/ntp/ntpd/ntp_restrict.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ntp_restrict.c,v 1.2 2003/12/04 16:23:37 drochner Exp $	*/
+/*	$NetBSD: ntp_restrict.c,v 1.3 2006/03/19 07:02:47 kardel Exp $	*/
 
 /*
  * ntp_restrict.c - determine host restrictions
@@ -529,8 +529,13 @@ hack_restrict(
 				rl6->addr6 = addr6;
 				rl6->mask6 = mask6;
 				rl6->mflags = (u_short)mflags;
-				rl6->next = rlprev6->next;
-				rlprev6->next = rl6;
+                                if (rlprev6) {
+                                        rl6->next = rlprev6->next;
+                                        rlprev6->next = rl6;
+                                } else {
+                                        rl6->next = restrictlist6;
+                                        restrictlist6 = rl6;
+                                }
 				restrictcount6++;
 			}
 			if ((rl6->flags ^ (u_short)flags) &
@@ -566,7 +571,11 @@ hack_restrict(
 			if (rl6 != 0 &&
 			    !IN6_IS_ADDR_UNSPECIFIED(&rl6->addr6)
 			    && !(rl6->mflags & RESM_INTERFACE)) {
-				rlprev6->next = rl6->next;
+                                if (rlprev6) {
+                                        rlprev6->next = rl6->next;
+                                } else {
+                                        restrictlist6 = rl6->next;
+                                }
 				restrictcount6--;
 				if (rl6->flags & RES_LIMITED) {
 					res_limited_refcnt6--;