From 64f99350351bc46e016b2286f36ba7cd669b79e3 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 23 Aug 2023 07:26:01 +0200
Subject: [PATCH] gh-108342: Break ref cycle in SSLSocket._create() exc
 (#108344)

Explicitly break a reference cycle when SSLSocket._create() raises an
exception. Clear the variable storing the exception, since the
exception traceback contains the variables and so creates a reference
cycle.

This test leak was introduced by the test added for the fix of #108310.
---
 Lib/ssl.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Lib/ssl.py b/Lib/ssl.py
index ff363c75e7dfd8..c4c5a4ca894ee5 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -1021,7 +1021,11 @@ def _create(cls, sock, server_side=False, do_handshake_on_connect=True,
                     self.close()
                 except OSError:
                     pass
-                raise notconn_pre_handshake_data_error
+                try:
+                    raise notconn_pre_handshake_data_error
+                finally:
+                    # Explicitly break the reference cycle.
+                    notconn_pre_handshake_data_error = None
         else:
             connected = True