Issue #26309: Shut down SocketServer request if verify_request() is false

Based on patch by Aviv Palivoda.

Lib/SocketServer.py

@@ -296,6 +296,8 @@ class BaseServer:
             except:
                 self.handle_error(request, client_address)
                 self.shutdown_request(request)
+        else:
+            self.shutdown_request(request)
 
     def handle_timeout(self):
         """Called if no new request arrives within self.timeout.

Lib/test/test_socketserver.py

@@ -326,6 +326,29 @@ class SocketServerTest(unittest.TestCase):
                 SocketServer.TCPServer((HOST, -1),
                                        SocketServer.StreamRequestHandler)
 
+    def test_shutdown_request_called_if_verify_request_false(self):
+        # Issue #26309: BaseServer should call shutdown_request even if
+        # verify_request is False
+        result = {"shutdown_called": False}
+
+        class MyServer(SocketServer.TCPServer):
+            def verify_request(self, request, client_address):
+                return False
+
+            def shutdown_request(self, request):
+                result["shutdown_called"] = True
+                SocketServer.TCPServer.shutdown_request(self, request)
+
+        def connect_to_server(proto, addr):
+            s = socket.socket(proto, socket.SOCK_STREAM)
+            s.connect(addr)
+            s.close()
+
+        self.run_server(MyServer,
+                        SocketServer.StreamRequestHandler,
+                        connect_to_server)
+        self.assertEqual(result["shutdown_called"], True)
+
 
 def test_main():
     if imp.lock_held():

Misc/NEWS

@@ -50,6 +50,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #26309: In the "socketserver" module, shut down the request (closing
+  the connected socket) when verify_request() returns false.  Based on patch
+  by Aviv Palivoda.
+
 - Issue #25939: On Windows open the cert store readonly in ssl.enum_certificates.
 
 - Issue #24303: Fix random EEXIST upon multiprocessing semaphores creation with