Undefined behavior in Objects/genericaliasobject.c

[ZackerySpytz]

BPO	42814
Nosy	@vstinner, @ZackerySpytz
PRs	bpo-42814: Fix undefined behavior in Objects/genericaliasobject.c #24073

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-01-03.12:22:16.026>
created_at = <Date 2021-01-03.11:40:24.596>
labels = ['interpreter-core', '3.10']
title = 'Undefined behavior in Objects/genericaliasobject.c'
updated_at = <Date 2021-01-03.12:22:16.025>
user = 'https://github.com/ZackerySpytz'

bugs.python.org fields:

activity = <Date 2021-01-03.12:22:16.025>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2021-01-03.12:22:16.026>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2021-01-03.11:40:24.596>
creator = 'ZackerySpytz'
dependencies = []
files = []
hgrepos = []
issue_num = 42814
keywords = ['patch']
message_count = 3.0
messages = ['384261', '384266', '384267']
nosy_count = 2.0
nosy_names = ['vstinner', 'ZackerySpytz']
pr_nums = ['24073']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42814'
versions = ['Python 3.10']

[ZackerySpytz]

In is_typing_name(), va_end() is not always called before the function returns. It is undefined behavior to call va_start() without also calling va_end().

[vstinner]

New changeset 5d3553b by Zackery Spytz in branch 'master':
bpo-42814: Fix undefined behavior in Objects/genericaliasobject.c (GH-24073)
5d3553b

[vstinner]

Thanks for the fix!