[issue27963] null poiter dereference in set_conversion_mode due uncheck _ctypes_conversion_errors

[Xiang Zhang]

Xiang Zhang added the comment:

Hmm, I tested the example snippet but it works. And PyMem_Free shouldn't fail when encounter NULL. The doc explicitly says "If p is NULL, no operation is performed".

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nosy: +xiang.zhang

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