From 7f44ea42b5620fb556418b06afd2917e3afbc19a Mon Sep 17 00:00:00 2001
From: Mike Morrison <bikemike@gmail.com>
Date: Mon, 21 May 2018 23:39:40 -0700
Subject: [PATCH] fix issue with compressed pointer (issue 4648)

---
 libraries/ESP8266mDNS/ESP8266mDNS.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libraries/ESP8266mDNS/ESP8266mDNS.cpp b/libraries/ESP8266mDNS/ESP8266mDNS.cpp
index e155c9387a..2344b0833c 100644
--- a/libraries/ESP8266mDNS/ESP8266mDNS.cpp
+++ b/libraries/ESP8266mDNS/ESP8266mDNS.cpp
@@ -551,7 +551,8 @@ void MDNSResponder::_parsePacket(){
         if (tmp8 & 0xC0) { // Compressed pointer
           uint16_t offset = ((((uint16_t)tmp8) & ~0xC0) << 8) | _conn_read8();
           if (_conn->isValidOffset(offset)) {
-              last_bufferpos  = _conn->tell();
+              if (0 == last_bufferpos)
+                last_bufferpos  = _conn->tell();
 #ifdef DEBUG_ESP_MDNS_RX
               DEBUG_ESP_PORT.print("Compressed pointer, jumping from ");
               DEBUG_ESP_PORT.print(last_bufferpos);