From f157c293ca9fc4b98487994845510f6067192baa Mon Sep 17 00:00:00 2001
From: amedama41 <kamo.tanabota@gmail.com>
Date: Sun, 25 Oct 2015 16:28:13 +0900
Subject: [PATCH] Fix data loss when async_read_some is pending

---
 include/boost/asio/ssl/detail/io.hpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/boost/asio/ssl/detail/io.hpp b/include/boost/asio/ssl/detail/io.hpp
index 2e889ec8..b0a99321 100644
--- a/include/boost/asio/ssl/detail/io.hpp
+++ b/include/boost/asio/ssl/detail/io.hpp
@@ -225,8 +225,18 @@ class io_op
         }
 
         default:
-        if (bytes_transferred == ~std::size_t(0))
+        if (bytes_transferred == ~std::size_t(0)) {
+          if (want_ == engine::want_output) {
+            // Pass the result to the handler.
+            op_.call_handler(handler_,
+                core_.engine_.map_error_code(ec_),
+                ec_ ? 0 : bytes_transferred_);
+            return;
+          }
           bytes_transferred = 0; // Timer cancellation, no data transferred.
+          ec = boost::system::error_code();
+          continue;
+        }
         else if (!ec_)
           ec_ = ec;