[3.6] bpo-33037: Skip sending/receiving after SSL transport closing (GH-6044) (GH-6058)

* Skip write()/data_received() if sslpipe is destroyed.
(cherry picked from commit 5e80a71ab67045fecec46573a1892e240b569ace)

1 files changed, 5 insertions, 1 deletions

diff --git a/Lib/asyncio/sslproto.py b/Lib/asyncio/sslproto.py
index f4d8a48..a82babb 100644
--- a/Lib/asyncio/sslproto.py
+++ b/Lib/asyncio/sslproto.py
@@ -497,6 +497,10 @@ class SSLProtocol(protocols.Protocol):
 
         The argument is a bytes object.
         """
+        if self._sslpipe is None:
+            # transport closing, sslpipe is destroyed
+            return
+
         try:
             ssldata, appdata = self._sslpipe.feed_ssldata(data)
         except ssl.SSLError as e:
@@ -626,7 +630,7 @@ class SSLProtocol(protocols.Protocol):
 
     def _process_write_backlog(self):
         # Try to make progress on the write backlog.
-        if self._transport is None:
+        if self._transport is None or self._sslpipe is None:
             return
 
         try: