[issue21983] segfault in ctypes.cast

[Anthony LaTorre]

New submission from Anthony LaTorre:

I get a segfault when trying to cast a string to a structure. 
>>> import ctypes
>>> class Struct(ctypes.Structure):
...     _fields_ = [('a', ctypes.c_uint32)]
... 
>>> s = '0'*100
>>> ctypes.cast(s,Struct)
Segmentation fault

The docs (https://docs.python.org/2/library/ctypes.html#ctypes.cast) say that `obj` "must be an object that can be interpreted as a pointer", so I assume this should return the same exception you get when trying to cast a list:

>>> ctypes.cast(range(10),Struct)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.4/ctypes/__init__.py", line 488, in cast
    return _cast(obj, obj, typ)
ctypes.ArgumentError: argument 1: <class 'TypeError'>: wrong type

----------
messages: 223062
nosy: Anthony.LaTorre
priority: normal
severity: normal
status: open
title: segfault in ctypes.cast
type: crash
versions: Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21983>
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