ITS#9000 memberof: noop a noop rename

servers/slapd/overlays/memberof.c

@@ -364,6 +364,12 @@ memberof_value_modify(
 	struct berval	values[ 4 ], nvalues[ 4 ];
 	int		mcnt = 0;
 
+	if ( old_ndn != NULL && new_ndn != NULL &&
+		ber_bvcmp( old_ndn, new_ndn ) == 0 ) {
+	    /* DNs compare equal, it's a noop */
+	    return;
+	}
+
 	op2.o_tag = LDAP_REQ_MODIFY;
 
 	op2.o_req_dn = *ndn;

tests/scripts/test052-memberof

@@ -262,6 +262,11 @@ $LDAPMODIFY -h $LOCALHOST -p $PORT1 \
 	>> $TESTOUT 2>&1 << EOF
 dn: cn=Cartoonia,ou=Groups,$BASEDN
 changetype: modrdn
+newrdn: cn=Toon town
+deleteoldrdn: 1
+
+dn: cn=Toon town,ou=Groups,$BASEDN
+changetype: modrdn
 newrdn: cn=Toon Town
 deleteoldrdn: 1
 EOF