[issue30708] Ensure that the result of PyUnicode_AsWideCharString() doesn't contain null characters if size is not returned

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This change needs changing one ctypes test, and can break third-party tests or even a code. That is why it is targeted only for 3.7. I'm going to backport the change as a private function for using in CPython internally since this can fix vulnerabilities.

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<http://bugs.python.org/issue30708>
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