[Python-Dev] Assertion in _PyManagedBuffer_FromObject() (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Fri Mar 2 13:25:08 CET 2012

On Fri, Mar 2, 2012 at 8:19 PM, Stefan Behnel <stefan_ml at behnel.de> wrote:

I'm not saying that this is likely to happen, but I could imagine code that wants to use a different object for the cleanup than itself, possibly for keeping a certain kind of state when it delivers more than one buffer, or for remembering what kind of allocation was used, or ...

Supporting that kind of behaviour is what the "internal" field is for.

However, given the lack of control, an assert() isn't the appropriate tool here - PyObject_GetBuffer itself should be checking the constraint and then reporting an error if the check fails. Otherwise a misbehaving extension module could trivially crash the Python interpreter by returning a bad Py_buffer.

Regards, Nick

-- Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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