[issue23878] Missing sanity checks for various C library function calls...

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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pull_requests: +15123
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15424

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23878>
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