diff -urp bind-9.4-ESV-R5/CHANGES bind-9.4-ESV-R5-P1/CHANGES
--- bind-9.4-ESV-R5/CHANGES	2011-07-22 06:24:00 +0000
+++ bind-9.4-ESV-R5-P1/CHANGES	2011-11-16 09:33:40 +0000
@@ -1,3 +1,9 @@
+	--- 9.4-ESV-R5-P1 released ---
+
+3218.	[security]	Cache lookup could return RRSIG data associated with
+			nonexistent records, leading to an assertion
+			failure. [RT #26590]
+
 	--- 9.4-ESV-R5 released ---
 
 3135.	[port]		FreeBSD: workaround broken IPV6_USE_MIN_MTU processing.
diff -urp bind-9.4-ESV-R5/bin/named/query.c bind-9.4-ESV-R5-P1/bin/named/query.c
--- bind-9.4-ESV-R5/bin/named/query.c	2010-11-17 10:21:01 +0000
+++ bind-9.4-ESV-R5-P1/bin/named/query.c	2011-11-16 09:33:40 +0000
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: query.c,v 1.257.18.56 2010-11-17 10:21:01 marka Exp $ */
+/* $Id: query.c,v 1.257.18.56.12.1 2011-11-16 09:33:40 each Exp $ */
 
 /*! \file */
 
@@ -1251,11 +1251,9 @@ query_addadditional(void *arg, dns_name_
 			goto addname;
 		if (result == DNS_R_NCACHENXRRSET) {
 			dns_rdataset_disassociate(rdataset);
-			/*
-			 * Negative cache entries don't have sigrdatasets.
-			 */
-			INSIST(sigrdataset == NULL ||
-			       ! dns_rdataset_isassociated(sigrdataset));
+			if (sigrdataset != NULL &&
+			    dns_rdataset_isassociated(sigrdataset))
+				dns_rdataset_disassociate(sigrdataset);
 		}
 		if (result == ISC_R_SUCCESS) {
 			mname = NULL;
@@ -1296,8 +1294,9 @@ query_addadditional(void *arg, dns_name_
 			goto addname;
 		if (result == DNS_R_NCACHENXRRSET) {
 			dns_rdataset_disassociate(rdataset);
-			INSIST(sigrdataset == NULL ||
-			       ! dns_rdataset_isassociated(sigrdataset));
+			if (sigrdataset != NULL &&
+			    dns_rdataset_isassociated(sigrdataset))
+				dns_rdataset_disassociate(sigrdataset);
 		}
 		if (result == ISC_R_SUCCESS) {
 			mname = NULL;
@@ -1746,10 +1745,8 @@ query_addadditional2(void *arg, dns_name
 		goto setcache;
 	if (result == DNS_R_NCACHENXRRSET) {
 		dns_rdataset_disassociate(rdataset);
-		/*
-		 * Negative cache entries don't have sigrdatasets.
-		 */
-		INSIST(! dns_rdataset_isassociated(sigrdataset));
+		if (dns_rdataset_isassociated(sigrdataset))
+			dns_rdataset_disassociate(sigrdataset);
 	}
 	if (result == ISC_R_SUCCESS) {
 		/* Remember the result as a cache */
diff -urp bind-9.4-ESV-R5/lib/dns/rbtdb.c bind-9.4-ESV-R5-P1/lib/dns/rbtdb.c
--- bind-9.4-ESV-R5/lib/dns/rbtdb.c	2011-06-09 00:42:47 +0000
+++ bind-9.4-ESV-R5-P1/lib/dns/rbtdb.c	2011-11-16 09:33:41 +0000
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rbtdb.c,v 1.196.18.67 2011-06-09 00:42:47 each Exp $ */
+/* $Id: rbtdb.c,v 1.196.18.67.2.1 2011-11-16 09:33:41 each Exp $ */
 
 /*! \file */
 
@@ -3672,7 +3672,7 @@ cache_find(dns_db_t *db, dns_name_t *nam
 	    result == DNS_R_NCACHENXRRSET) {
 		bind_rdataset(search.rbtdb, node, found, search.now,
 			      rdataset);
-		if (foundsig != NULL)
+		if (!NEGATIVE(found) && foundsig != NULL)
 			bind_rdataset(search.rbtdb, node, foundsig, search.now,
 				      sigrdataset);
 	}
@@ -4258,7 +4258,7 @@ cache_findrdataset(dns_db_t *db, dns_dbn
 	}
 	if (found != NULL) {
 		bind_rdataset(rbtdb, rbtnode, found, now, rdataset);
-		if (foundsig != NULL)
+		if (!NEGATIVE(found) && foundsig != NULL)
 			bind_rdataset(rbtdb, rbtnode, foundsig, now,
 				      sigrdataset);
 	}
diff -urp bind-9.4-ESV-R5/version bind-9.4-ESV-R5-P1/version
--- bind-9.4-ESV-R5/version	2011-07-21 02:11:00 +0000
+++ bind-9.4-ESV-R5-P1/version	2011-11-16 09:33:40 +0000
@@ -1,4 +1,4 @@
-# $Id: version,v 1.29.134.35 2011-07-21 02:11:00 marka Exp $
+# $Id: version,v 1.29.134.35.2.1 2011-11-16 09:33:40 each Exp $
 #
 # This file must follow /bin/sh rules.  It is imported directly via
 # configure.
@@ -7,4 +7,4 @@ MAJORVER=9
 MINORVER=4
 PATCHVER=
 RELEASETYPE=-ESV
-RELEASEVER=-R5
+RELEASEVER=-R5-P1