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authorAndrew Tridgell <tridge@samba.org>2010-04-20 15:33:00 +1000
committerAndrew Tridgell <tridge@samba.org>2010-04-20 15:50:27 +1000
commitf1c523939b88aee0b1ce7375d68b06a0b8cf5d28 (patch)
treeaae27335d6a01e6ffaaf2a7901ef6b1aa14eae3d /source4/torture
parent45be1c7ba4382d85c742a241687bbc6d5a2ebd8c (diff)
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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>
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