Break circular references when closing SSLTransport objects (#981) (#2049)

Lib/asyncio/sslproto.py

@@ -686,12 +686,14 @@ class SSLProtocol(protocols.Protocol):
             self._transport._force_close(exc)
 
     def _finalize(self):
+        self._sslpipe = None
+
         if self._transport is not None:
             self._transport.close()
 
     def _abort(self):
-        if self._transport is not None:
-            try:
+        try:
+            if self._transport is not None:
                 self._transport.abort()
-            finally:
-                self._finalize()
+        finally:
+            self._finalize()

Misc/NEWS

@@ -49,6 +49,9 @@ Core and Builtins
 Library
 -------
 
+- bpo-29870: Fix ssl sockets leaks when connection is aborted in asyncio/ssl
+  implementation. Patch by Michaël Sghaïer.
+
 - bpo-29743: Closing transport during handshake process leaks open socket.
   Patch by Nikolay Kim