asio & ssl - leaking io_handlers after boost::asio::io_service object is stopped and destroyed

[tianhao.qiu@…]

The way boost::asio::ssl::detail::openssl_stream_service is implemented requires that function handler_impl() has to be called before io_handler objects can be deleted. However when the io_service object is stopped and later destroyed, the handlers for those pending SSL operations will never be called, thus causing the leak.

Since I am binding shared_ptr<ssl_session>s into my SSL handlers, this leak will also keep alive my SSL session objects.

[tianhao.qiu@…]

Patch submitted.

The old design deletes the handler (io_handler/handshake_handler/shutdown_handler) and openssl_operation objects in the handler_impl() function. However pending handler_impl() functions are not invoked when the io_service object is stopped, thus causing the leak.

The patch addresses the problem by wrapping the handler and openssl_operation objects in shared_ptrs.

[chris_kohlhoff]

As of [72428], the release branch contains the new SSL implementation that addresses this.