[issue34456] pickle: Missing NULL check in save_global()

[Alexey Izbyshev]

New submission from Alexey Izbyshev <izbyshev at ispras.ru>:

The return value of Py_BuildValue() is dereferenced without checking at https://github.com/python/cpython/blob/ef8861c112ed1dac9351958c121bc24ca4ecdb08/Modules/_pickle.c#L3457

Reported by Svace static analyzer.

----------
components: Extension Modules
messages: 323853
nosy: izbyshev, serhiy.storchaka
priority: normal
severity: normal
status: open
title: pickle: Missing NULL check in save_global()
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34456>
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