Patch for use-after-free (upstream PR me-no-dev#952) (#6)

Author: Aircoookie

library.json

@@ -12,7 +12,7 @@
     "type": "git",
     "url": "https://github.com/me-no-dev/ESPAsyncWebServer.git"
   },
-  "version": "2.0.5",
+  "version": "2.0.6",
   "license": "LGPL-3.0",
   "frameworks": "arduino",
   "platforms": ["espressif8266", "espressif32"],

library.properties

@@ -1,5 +1,5 @@
 name=ESP Async WebServer
-version=2.0.5
+version=2.0.6
 author=Me-No-Dev
 maintainer=Me-No-Dev
 sentence=Async Web Server for ESP8266 and ESP31B (Aircoookie fork)

src/StringArray.h

@@ -47,10 +47,19 @@ class LinkedList {
 
     class Iterator {
       ItemType* _node;
+      ItemType* _nextNode = nullptr;
     public:
-      Iterator(ItemType* current = nullptr) : _node(current) {}
-      Iterator(const Iterator& i) : _node(i._node) {}
-      Iterator& operator ++() { _node = _node->next; return *this; }
+      Iterator(ItemType* current = nullptr) : _node(current) {
+          _nextNode = _node != nullptr ? _node->next : nullptr;
+      }
+      Iterator(const Iterator& i) : _node(i._node) {
+          _nextNode = _node != nullptr ? _node->next : nullptr;
+      }
+      Iterator& operator ++() {
+          _node = _nextNode;
+          _nextNode = _node != nullptr ? _node->next : nullptr;
+          return *this;
+      }
       bool operator != (const Iterator& i) const { return _node != i._node; }
       const T& operator * () const { return _node->value(); }
       const T* operator -> () const { return &_node->value(); }