diff --git a/lib/dns/rdatalist.c b/lib/dns/rdatalist.c
index 8f46faf60d..535a271155 100644
--- a/lib/dns/rdatalist.c
+++ b/lib/dns/rdatalist.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdatalist.c,v 1.38 2010/02/25 05:08:01 tbox Exp $ */
+/* $Id: rdatalist.c,v 1.39 2010/11/16 00:50:28 marka Exp $ */
 
 /*! \file */
 
@@ -54,6 +54,8 @@ static dns_rdatasetmethods_t methods = {
 void
 dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
 
+	REQUIRE(rdatalist != NULL);
+
 	/*
 	 * Initialize rdatalist.
 	 */
@@ -125,6 +127,8 @@ isc_result_t
 isc__rdatalist_next(dns_rdataset_t *rdataset) {
 	dns_rdata_t *rdata;
 
+	REQUIRE(rdataset != NULL);
+
 	rdata = rdataset->private2;
 	if (rdata == NULL)
 		return (ISC_R_NOMORE);
@@ -141,6 +145,8 @@ void
 isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
 	dns_rdata_t *list_rdata;
 
+	REQUIRE(rdataset != NULL);
+
 	list_rdata = rdataset->private2;
 	INSIST(list_rdata != NULL);
 
@@ -149,6 +155,10 @@ isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
 
 void
 isc__rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
+
+	REQUIRE(source != NULL);
+	REQUIRE(target != NULL);
+
 	*target = *source;
 
 	/*
@@ -163,6 +173,8 @@ isc__rdatalist_count(dns_rdataset_t *rdataset) {
 	dns_rdata_t *rdata;
 	unsigned int count;
 
+	REQUIRE(rdataset != NULL);
+
 	rdatalist = rdataset->private1;
 
 	count = 0;
@@ -181,6 +193,8 @@ isc__rdatalist_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name) {
 	dns_rdataset_t *rdset;
 	dns_ttl_t ttl;
 
+	REQUIRE(rdataset != NULL);
+
 	for (rdset = ISC_LIST_HEAD(name->list);
 	     rdset != NULL;
 	     rdset = ISC_LIST_NEXT(rdset, link))
@@ -228,7 +242,9 @@ isc__rdatalist_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
 	dns_rdataset_t *tnegsig = NULL;
 	dns_name_t *noqname = rdataset->private6;
 
+	REQUIRE(rdataset != NULL);
 	REQUIRE((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0);
+
 	(void)dns_name_dynamic(noqname);	/* Sanity Check. */
 
 	for (rdataset = ISC_LIST_HEAD(noqname->list);
@@ -268,6 +284,8 @@ isc__rdatalist_addclosest(dns_rdataset_t *rdataset, dns_name_t *name) {
 	dns_rdataset_t *rdset;
 	dns_ttl_t ttl;
 
+	REQUIRE(rdataset != NULL);
+
 	for (rdset = ISC_LIST_HEAD(name->list);
 	     rdset != NULL;
 	     rdset = ISC_LIST_NEXT(rdset, link))
@@ -315,7 +333,9 @@ isc__rdatalist_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
 	dns_rdataset_t *tnegsig = NULL;
 	dns_name_t *closest = rdataset->private7;
 
+	REQUIRE(rdataset != NULL);
 	REQUIRE((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) != 0);
+
 	(void)dns_name_dynamic(closest);	/* Sanity Check. */
 
 	for (rdataset = ISC_LIST_HEAD(closest->list);