[issue27963] null poiter dereference in set_conversion_mode due uncheck _ctypes_conversion_errors

[Xiang Zhang]

Xiang Zhang added the comment:

Ooh, I treat dereference as decref, sorry. Then I think it may happen when there is not enough memory. But your patch is not complete, at least you should Py_DECREF(result). But this function may need more care since the malloc failure in it will alter states.

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<http://bugs.python.org/issue27963>
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