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A possible crash in dictobject.c's new_dict() #80593

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ZackerySpytz mannequin opened this issue Mar 24, 2019 · 3 comments
Closed

A possible crash in dictobject.c's new_dict() #80593

ZackerySpytz mannequin opened this issue Mar 24, 2019 · 3 comments
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3.8 (EOL) end of life interpreter-core (Objects, Python, Grammar, and Parser dirs) type-crash A hard crash of the interpreter, possibly with a core dump

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@ZackerySpytz
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ZackerySpytz mannequin commented Mar 24, 2019

BPO 36412
Nosy @methane, @ZackerySpytz
PRs
  • bpo-36412: Fix a possible crash in dictobject.c's new_dict() #12519
  • 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 2019-03-24.02:23:44.939>
    created_at = <Date 2019-03-24.01:49:34.930>
    labels = ['interpreter-core', '3.8', 'type-crash']
    title = "A possible crash in dictobject.c's new_dict()"
    updated_at = <Date 2019-03-24.02:52:58.792>
    user = 'https://github.com/ZackerySpytz'

    bugs.python.org fields:

    activity = <Date 2019-03-24.02:52:58.792>
    actor = 'methane'
    assignee = 'none'
    closed = True
    closed_date = <Date 2019-03-24.02:23:44.939>
    closer = 'methane'
    components = ['Interpreter Core']
    creation = <Date 2019-03-24.01:49:34.930>
    creator = 'ZackerySpytz'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 36412
    keywords = ['patch']
    message_count = 3.0
    messages = ['338711', '338712', '338713']
    nosy_count = 2.0
    nosy_names = ['methane', 'ZackerySpytz']
    pr_nums = ['12519']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'crash'
    url = 'https://bugs.python.org/issue36412'
    versions = ['Python 3.8']

    @ZackerySpytz
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    ZackerySpytz mannequin commented Mar 24, 2019

    PyDict_New() calls new_dict() with the "empty_values" array. If the PyObject_GC_New() call in new_dict() fails, new_dict() will call PyMem_FREE() on this array, causing a crash.

    @ZackerySpytz ZackerySpytz mannequin added 3.8 (EOL) end of life interpreter-core (Objects, Python, Grammar, and Parser dirs) type-crash A hard crash of the interpreter, possibly with a core dump labels Mar 24, 2019
    @methane
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    methane commented Mar 24, 2019

    New changeset 3d07c1e by Inada Naoki (Zackery Spytz) in branch 'master':
    bpo-36412: fix a possible crash in dictobject.c's new_dict() (GH-12519)
    3d07c1e

    @methane methane closed this as completed Mar 24, 2019
    @methane
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    methane commented Mar 24, 2019

    Thank you, nice catch!
    How did you find it?

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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    Labels
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