From: Zachary Sailer <zachsailer@gmail.com>
Date: Sun, 9 Jun 2019 21:15:31 +0000 (-0700)
Subject: iostream: check that stream is open before trying to read (#2670)
X-Git-Tag: v6.1.0b1~72
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbd1a8fb95d1d24acd100426077c37d6f77e497b;p=thirdparty%2Ftornado.git

iostream: check that stream is open before trying to read (#2670)
---

diff --git a/tornado/iostream.py b/tornado/iostream.py
index 6ea748a54..ee305922d 100644
--- a/tornado/iostream.py
+++ b/tornado/iostream.py
@@ -794,6 +794,7 @@ class BaseIOStream(object):
             self._read_from_buffer(pos)
 
     def _start_read(self) -> Future:
+        self._check_closed()  # Before reading, check that stream is not closed.
         assert self._read_future is None, "Already reading"
         self._read_future = Future()
         return self._read_future