From fdb47c9f83adf4f57810fdb2f615c31a94534d5e Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Tue, 23 Aug 2016 10:47:23 +0200
Subject: [PATCH] dnsdist: Fix invalid outstanding count for {A,I}XFR over TCP

---
 pdns/dnsdist-tcp.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pdns/dnsdist-tcp.cc b/pdns/dnsdist-tcp.cc
index c76cb1e196..9b71b356e1 100644
--- a/pdns/dnsdist-tcp.cc
+++ b/pdns/dnsdist-tcp.cc
@@ -415,8 +415,11 @@ void* tcpClientThread(int pipefd)
         readn2WithTimeout(dsock, answerbuffer, rlen, ds->tcpRecvTimeout);
         char* response = answerbuffer;
         uint16_t responseLen = rlen;
-        --ds->outstanding;
-        outstanding = false;
+        if (outstanding) {
+          /* might be false for {A,I}XFR */
+          --ds->outstanding;
+          outstanding = false;
+        }
 
         if (rlen < sizeof(dnsheader)) {
           break;
-- 
2.47.2