Fix bug in ReliableQuicStream::WritevData() where if the write failed and the connection was closed…

net/quic/reliable_quic_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/reliable_quic_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/iovector.h"
 #include "net/quic/quic_ack_listener_interface.h"
 #include "net/quic/quic_flags.h"
@@ skipping 307 matching lines @@
     write_length = static_cast<size_t>(send_window);
   }
 
   QuicConsumedData consumed_data = session()->WritevData(
       id(), QuicIOVector(iov, iov_count, write_length), stream_bytes_written_,
       fin, GetFecProtection(), ack_listener);
   stream_bytes_written_ += consumed_data.bytes_consumed;
 
   AddBytesSent(consumed_data.bytes_consumed);
 
+  // The write may have generated a write error causing this stream to be
+  // closed. If so, simply return without marking the stream write blocked.
+  if (write_side_closed_) {
+    return consumed_data;
+  }
+
   if (consumed_data.bytes_consumed == write_length) {
     if (!fin_with_zero_data) {
       MaybeSendBlocked();
     }
     if (fin && consumed_data.fin_consumed) {
       fin_sent_ = true;
       if (fin_received_) {
         session_->StreamDraining(id_);
       }
       CloseWriteSide();
@@ skipping 126 matching lines @@
   }
 }
 
 void ReliableQuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
 }  // namespace net