bpo-33674: asyncio: Fix SSLProtocol race (GH-7175) (#7187)
Fix a race condition in SSLProtocol.connection_made() of
asyncio.sslproto: start immediately the handshake instead of using
call_soon(). Previously, data_received() could be called before the
handshake started, causing the handshake to hang or fail.
(cherry picked from commit be00a5583a2cb696335c527b921d1868266a42c6)
Co-authored-by: Victor Stinner <vstinner@redhat.com>
diff --git a/Lib/asyncio/sslproto.py b/Lib/asyncio/sslproto.py
index 2bfa45d..ab43e93 100644
--- a/Lib/asyncio/sslproto.py
+++ b/Lib/asyncio/sslproto.py
@@ -592,10 +592,10 @@
# (b'', 1) is a special value in _process_write_backlog() to do
# the SSL handshake
self._write_backlog.append((b'', 1))
- self._loop.call_soon(self._process_write_backlog)
self._handshake_timeout_handle = \
self._loop.call_later(self._ssl_handshake_timeout,
self._check_handshake_timeout)
+ self._process_write_backlog()
def _check_handshake_timeout(self):
if self._in_handshake is True:
diff --git a/Misc/NEWS.d/next/Library/2018-05-28-22-49-59.bpo-33674.6LFFj7.rst b/Misc/NEWS.d/next/Library/2018-05-28-22-49-59.bpo-33674.6LFFj7.rst
new file mode 100644
index 0000000..1e98680
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-05-28-22-49-59.bpo-33674.6LFFj7.rst
@@ -0,0 +1,4 @@
+Fix a race condition in SSLProtocol.connection_made() of asyncio.sslproto:
+start immediately the handshake instead of using call_soon(). Previously,
+data_received() could be called before the handshake started, causing the
+handshake to hang or fail.