Core/Networking: Fixed a crash caused by attempting to connect directly to worldserver by setting portal=worldserver address

Closes #16927

src/server/game/Server/WorldSocket.cpp

@@ -168,9 +168,21 @@ void WorldSocket::InitializeHandler(boost::system::error_code error, std::size_t
             ByteBuffer buffer(std::move(_packetBuffer));
 
             buffer >> magic;
+            if (magic != ConnectionInitializeMagic)
+            {
+                CloseSocket();
+                return;
+            }
+
             buffer >> length;
+            if (length > ClientConnectionInitialize.length())
+            {
+                CloseSocket();
+                return;
+            }
+
             std::string initializer = buffer.ReadString(length);
-            if (magic != ConnectionInitializeMagic || initializer != ClientConnectionInitialize)
+            if (initializer != ClientConnectionInitialize)
             {
                 CloseSocket();
                 return;