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Andrew Tridgell f1c523939b pytalloc: ensure talloc_ctx is directly after PyObject_HEAD
the talloc python interface for tp_alloc and tp_dealloc relies on a
cast to a py_talloc_Object to find the talloc_ctx (see
py_talloc_dealloc). This means we rely on the talloc_ctx for the
object being directly after the PyObject_HEAD

This fixes the talloc free with references bug in samba_dnsupdate

The actual problem was the tp_alloc() call in
PyCredentialCacheContainer_from_ccache_container() which used a cast
from a py_talloc_Object to a PyCredentialCacheContainerObject. That
case effectively changed the parent/child relationship between the
talloc_ctx and the ccc ptr.

This patch changes all the structures that follow this pattern to put
the TALLOC_CTX directly after the PyObject_HEAD, to ensure that if
anyone else decides to do a dangerous cast like this that it won't
cause the same sort of subtle breakage.

Pair-Programmed-With: Rusty Russell <rusty@samba.org>
2010-04-20 15:50:27 +10:00
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2008-12-21 07:34:27 +01:00
2010-04-08 23:22:55 +02:00