[Python-checkins] [3.11] gh-98539: Make _SSLTransportProtocol.abort() safe to call when closed (GH-104474) (#104485)

[gvanrossum]

https://github.com/python/cpython/commit/1afc0a9591460d85626f26a32ff0c56bcc06b8d8
commit: 1afc0a9591460d85626f26a32ff0c56bcc06b8d8
branch: 3.11
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: gvanrossum <gvanrossum at gmail.com>
date: 2023-05-14T21:24:07Z
summary:

[3.11] gh-98539: Make _SSLTransportProtocol.abort() safe to call when closed (GH-104474) (#104485)

(cherry picked from commit fb8739f0b6291fb048a94d6312f59ba4d10a20ca)

Co-authored-by: Sam Bull <git at sambull.org>

files:
M Lib/asyncio/sslproto.py

diff --git a/Lib/asyncio/sslproto.py b/Lib/asyncio/sslproto.py
index bbf9cad6bc7f..488e17d8bccd 100644
--- a/Lib/asyncio/sslproto.py
+++ b/Lib/asyncio/sslproto.py
@@ -244,7 +244,8 @@ def abort(self):
         called with None as its argument.
         """
         self._closed = True
-        self._ssl_protocol._abort()
+        if self._ssl_protocol is not None:
+            self._ssl_protocol._abort()
 
     def _force_close(self, exc):
         self._closed = True