From 44beee2f2cac5d07cc9806a3416fa9af95c34957 Mon Sep 17 00:00:00 2001
From: Rodrigo Garcia <rodrigo.garcia@espressif.com>
Date: Mon, 9 May 2022 09:59:24 -0300
Subject: [PATCH] Fixes DNS Server Memory Leak when deleted (#6707)

---
 libraries/DNSServer/src/DNSServer.cpp | 16 ++++++++++++++++
 libraries/DNSServer/src/DNSServer.h   |  1 +
 2 files changed, 17 insertions(+)

diff --git a/libraries/DNSServer/src/DNSServer.cpp b/libraries/DNSServer/src/DNSServer.cpp
index a7f0d15e..3aa7af16 100644
--- a/libraries/DNSServer/src/DNSServer.cpp
+++ b/libraries/DNSServer/src/DNSServer.cpp
@@ -20,6 +20,22 @@ DNSServer::DNSServer()
   _port = 0;
 }
 
+DNSServer::~DNSServer()
+{
+  if (_dnsHeader) {
+    free(_dnsHeader);
+    _dnsHeader = NULL;
+  }
+  if (_dnsQuestion) {
+    free(_dnsQuestion);
+    _dnsQuestion = NULL;
+  }
+  if (_buffer) {
+    free(_buffer);
+    _buffer = NULL;
+  }
+}
+
 bool DNSServer::start(const uint16_t &port, const String &domainName,
                      const IPAddress &resolvedIP)
 {
diff --git a/libraries/DNSServer/src/DNSServer.h b/libraries/DNSServer/src/DNSServer.h
index f237a4e3..1250f5ce 100644
--- a/libraries/DNSServer/src/DNSServer.h
+++ b/libraries/DNSServer/src/DNSServer.h
@@ -76,6 +76,7 @@ class DNSServer
 {
   public:
     DNSServer();
+    ~DNSServer();
     void processNextRequest();
     void setErrorReplyCode(const DNSReplyCode &replyCode);
     void setTTL(const uint32_t &ttl);