s4/messaging/py: Check py_return_ndr_struct() return value

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/source4/lib/messaging/pymessaging.c b/source4/lib/messaging/pymessaging.c
index 80ca7a990735c69c6e5feddc8f1ce6c2c8039dda..2fb201edf293366d8849633473301a668a37cbfb 100644 (file)
--- a/source4/lib/messaging/pymessaging.c
+++ b/source4/lib/messaging/pymessaging.c
@@ -218,6 +218,9 @@ static void py_msg_callback_wrapper(struct imessaging_context *msg,
 
        py_server_id = py_return_ndr_struct("samba.dcerpc.server_id", "server_id", p_server_id, p_server_id);
        talloc_unlink(NULL, p_server_id);
+       if (py_server_id == NULL) {
+               return;
+       }
 
        result = PyObject_CallFunction(callback, discard_const_p(char, "OiOs#"),
                                       py_private,