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bpo-33674: asyncio: Fix SSLProtocol race (GH-7175)

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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.
This commit is contained in:
Victor Stinner 2018-05-29 01:33:35 +02:00 committed by GitHub
parent 8c1ad0c4f6
commit be00a5583a
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 5 additions and 1 deletions
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2
Lib/asyncio/sslproto.py
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@ -592,10 +592,10 @@ def _start_handshake(self):
# (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:

4
Misc/NEWS.d/next/Library/2018-05-28-22-49-59.bpo-33674.6LFFj7.rst Normal file
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@ -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.