From: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Date: Thu, 1 Aug 2019 04:02:05 +0000 (+1200)
Subject: s4/messaging/py: don't DECREF borrowed references
X-Git-Url: http://git.samba.org/samba.git/?p=gd%2Fsamba-autobuild%2F.git;a=commitdiff_plain;h=d6a82edd19b82d99401a27dbc6fe10121142e431

s4/messaging/py: don't DECREF borrowed references

This made Message.deregister() a decref machine, with talloc crashes
and segfaults available thus:

    from samba import messaging
    m = messaging.Messaging()
    for i in range(20):
        m.deregister(m)

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>
---

diff --git a/source4/lib/messaging/pymessaging.c b/source4/lib/messaging/pymessaging.c
index 39c09a82403..e506d94f474 100644
--- a/source4/lib/messaging/pymessaging.c
+++ b/source4/lib/messaging/pymessaging.c
@@ -259,8 +259,6 @@ static PyObject *py_imessaging_deregister(PyObject *self, PyObject *args, PyObje
 
 	imessaging_deregister(iface->msg_ctx, msg_type, callback);
 
-	Py_DECREF(callback);
-
 	Py_RETURN_NONE;
 }