(svn r15206) -Fix [FS#2567]: memory corruption due to not properly cleanup up the mess when cancelling a download

src/network/core/tcp.cpp

@@ -20,7 +20,14 @@ NetworkTCPSocketHandler::NetworkTCPSocketHandler(SOCKET s) :
 
 NetworkTCPSocketHandler::~NetworkTCPSocketHandler()
 {
+	this->CloseConnection();
+
 	if (this->sock != INVALID_SOCKET) closesocket(this->sock);
+	this->sock = INVALID_SOCKET;
+}
+
+NetworkRecvStatus NetworkTCPSocketHandler::CloseConnection()
+{
 	this->writable = false;
 	this->has_quit = true;
 
@@ -33,7 +40,7 @@ NetworkTCPSocketHandler::~NetworkTCPSocketHandler()
 	delete this->packet_recv;
 	this->packet_recv = NULL;
 
-	this->sock = INVALID_SOCKET;
+	return NETWORK_RECV_STATUS_OKAY;
 }
 
 /**

src/network/core/tcp.h

@@ -22,6 +22,7 @@ private:
 public:
 	bool writable;            ///< Can we write to this socket?
 
+	virtual NetworkRecvStatus CloseConnection();
 	void Send_Packet(Packet *packet);
 	bool Send_Packets();
 	bool IsPacketQueueEmpty();

src/network/core/tcp_content.cpp

@@ -50,12 +50,6 @@ bool ContentInfo::IsValid() const
 	return this->state < ContentInfo::INVALID && this->type >= CONTENT_TYPE_BEGIN && this->type < CONTENT_TYPE_END;
 }
 
-NetworkRecvStatus NetworkContentSocketHandler::CloseConnection()
-{
-	this->has_quit = true;
-	return NETWORK_RECV_STATUS_OKAY;
-}
-
 void NetworkContentSocketHandler::Close()
 {
 	CloseConnection();

src/network/core/tcp_content.h

@@ -102,7 +102,6 @@ struct ContentInfo {
 class NetworkContentSocketHandler : public NetworkTCPSocketHandler {
 protected:
 	struct sockaddr_in client_addr; ///< The address we're connected to.
-	NetworkRecvStatus CloseConnection();
 	virtual void Close();
 
 	/**

src/network/network_content_gui.cpp

@@ -136,7 +136,10 @@ public:
 
 	virtual void OnClick(Point pt, int widget)
 	{
-		if (widget == NCDSWW_CANCELOK) delete this;
+		if (widget == NCDSWW_CANCELOK && this->downloaded_bytes != this->total_bytes) {
+			_network_content_client.Close();
+			delete this;
+		}
 	}
 
 	virtual void OnDownloadProgress(const ContentInfo *ci, uint bytes)