The tp_new implementation should initialize the errorhandler field,

gvanrossum · gvanrossum · commit e1c478ff8a8c · 2002-06-06T20:08:25.000Z
otherwise this code could segfault:

  from socket import socket
  s = socket.__new__(socket)
  s.recv(100)
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
@@ -1690,8 +1690,10 @@ PySocketSock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *new;
 
 	new = type->tp_alloc(type, 0);
-	if (new != NULL)
+	if (new != NULL) {
 		((PySocketSockObject *)new)->sock_fd = -1;
+		((PySocketSockObject *)new)->errorhandler = &PySocket_Err;
+	}
 	return new;
 }
 
