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Undefined C behavior going beyond end of struct via a [1] arrays (C99 flexible arrays) #84301

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@gpshead
Issue body actions
BPO 40120
Nosy @gpshead, @pitrou, @vstinner, @serhiy-storchaka, @colesbury, @pablogsal
PRs
  • bpo-40120: Fix unbounded struct char[] undefined behavior. #19232
  • 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 = 'https://github.com/gpshead'
    closed_at = None
    created_at = <Date 2020-03-30.21:04:23.697>
    labels = ['interpreter-core', 'build', '3.11']
    title = 'Undefined C behavior going beyond end of struct via a [1] arrays.'
    updated_at = <Date 2022-01-21.23:32:19.727>
    user = 'https://github.com/gpshead'

    bugs.python.org fields:

    activity = <Date 2022-01-21.23:32:19.727>
    actor = 'gregory.p.smith'
    assignee = 'gregory.p.smith'
    closed = False
    closed_date = None
    closer = None
    components = ['Interpreter Core']
    creation = <Date 2020-03-30.21:04:23.697>
    creator = 'gregory.p.smith'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 40120
    keywords = ['patch']
    message_count = 20.0
    messages = ['365349', '365350', '365399', '365403', '365410', '365415', '365425', '365464', '365465', '365466', '365472', '365539', '365671', '365691', '365744', '365745', '366883', '411151', '411168', '411207']
    nosy_count = 6.0
    nosy_names = ['gregory.p.smith', 'pitrou', 'vstinner', 'serhiy.storchaka', 'colesbury', 'pablogsal']
    pr_nums = ['19232']
    priority = 'normal'
    resolution = None
    stage = 'needs patch'
    status = 'open'
    superseder = None
    type = 'compile error'
    url = 'https://bugs.python.org/issue40120'
    versions = ['Python 3.11']

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    3.11only security fixesonly security fixesbuildThe build process and cross-buildThe build process and cross-buildinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
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