From ff87b5745a94a6339b6826a0e9dc770be926fa45 Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Wed, 11 Nov 2020 11:20:41 +0100
Subject: [PATCH] rec-4.4: do not send overly long NOD lookups

---
 pdns/pdns_recursor.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index c4f5a8a460..ed1be7ff9d 100644
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -1132,7 +1132,13 @@ static void sendNODLookup(const DNSName& dname)
     // Send a DNS A query to <domain>.g_nodLookupDomain
     static const QType qt(QType::A);
     static const uint16_t qc(QClass::IN);
-    DNSName qname = dname + g_nodLookupDomain;
+    DNSName qname;
+    try {
+      qname = dname + g_nodLookupDomain;
+    }
+    catch(const std::range_error &e) {
+      return;
+    }
     vector<DNSRecord> dummy;
     directResolve(qname, qt, qc, dummy);
   }
-- 
2.47.2