[New-bugs-announce] [issue20231] Argument Clinic accepts no-default args after default args

[Ryan Smith-Roberts]

New submission from Ryan Smith-Roberts:

A signature of the form

a: object = None
b: object

results in b being uninitialized in the generated C code prior to the PyArgs_ParseTuple call. If ParseTuple does not set a value for b (as it is an optional argument), b then contains a garbage pointer and the interpreter may segfault.

AC should reject this configuration.

----------
components: Build
messages: 207997
nosy: larry, rmsr
priority: normal
severity: normal
status: open
title: Argument Clinic accepts no-default args after default args
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20231>
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