From e3231d8a5c4c93aff5063dd3706c5a3cd88c35f8 Mon Sep 17 00:00:00 2001
From: Otto <otto.moerbeek@open-xchange.com>
Date: Wed, 15 Dec 2021 13:40:20 +0100
Subject: [PATCH] auth: save errno value as close(2) might clobber it

---
 pdns/nameserver.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pdns/nameserver.cc b/pdns/nameserver.cc
index ce07abdc7d..183033dd6e 100644
--- a/pdns/nameserver.cc
+++ b/pdns/nameserver.cc
@@ -150,13 +150,13 @@ void UDPNameserver::bindAddresses()
         g_localaddresses.push_back(locala);
 
     if(::bind(s, (sockaddr*)&locala, locala.getSocklen()) < 0) {
-      string binderror = stringerror();
+      int err = errno;
       close(s);
-      if( errno == EADDRNOTAVAIL && ! ::arg().mustDo("local-address-nonexist-fail") ) {
+      if (err == EADDRNOTAVAIL && !::arg().mustDo("local-address-nonexist-fail")) {
         g_log<<Logger::Error<<"Address " << locala << " does not exist on this server - skipping UDP bind" << endl;
         continue;
       } else {
-        g_log<<Logger::Error<<"Unable to bind UDP socket to '"+locala.toStringWithPort()+"': "<<binderror<<endl;
+        g_log<<Logger::Error<<"Unable to bind UDP socket to '"+locala.toStringWithPort()+"': "<<stringerror(err)<<endl;
         throw PDNSException("Unable to bind to UDP socket");
       }
     }
-- 
2.47.2