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segmentation fault when unicode(classic_class_instance) #61043

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draftcode mannequin opened this issue Jan 2, 2013 · 3 comments
Closed

segmentation fault when unicode(classic_class_instance) #61043

draftcode mannequin opened this issue Jan 2, 2013 · 3 comments
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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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@draftcode
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Mannequin

draftcode mannequin commented Jan 2, 2013

BPO 16839
Nosy @jcea, @benjaminp
Files
  • object_unicode.patch
    		•

    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 2013-01-02.15:37:52.577>
created_at = <Date 2013-01-02.13:50:36.115>
labels = ['interpreter-core', 'type-crash']
title = 'segmentation fault when unicode(classic_class_instance)'
updated_at = <Date 2013-01-02.20:44:45.728>
user = 'https://bugs.python.org/draftcode'

    bugs.python.org fields:

    activity = <Date 2013-01-02.20:44:45.728>
actor = 'jcea'
assignee = 'none'
closed = True
closed_date = <Date 2013-01-02.15:37:52.577>
closer = 'python-dev'
components = ['Interpreter Core']
creation = <Date 2013-01-02.13:50:36.115>
creator = 'draftcode'
dependencies = []
files = ['28528']
hgrepos = []
issue_num = 16839
keywords = ['patch']
message_count = 3.0
messages = ['178811', '178817', '178818']
nosy_count = 4.0
nosy_names = ['jcea', 'benjamin.peterson', 'python-dev', 'draftcode']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue16839'
versions = ['Python 2.7']
    @draftcode
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    draftcode mannequin commented Jan 2, 2013

    Python 2.7.3 crushes when the following code is run without any library, which means run python with -S option:

        class Test:
        pass
    unicode(Test())

    In the course of the interpreter tries to find the "__unicode__" attribute in a class, it uses a cached python string of "__unicode__". The reason of this crush is that the cached value is used before initialized. It is initialized only when trying to find the one of a new-style class, so the interpreter will crush if one uses only classic classes.

    The attached patch will fix this issue by initializing a cached value before it is used.

    Thanks.

    @draftcode draftcode mannequin added interpreter-core (Objects, Python, Grammar, and Parser dirs) type-crash A hard crash of the interpreter, possibly with a core dump labels Jan 2, 2013
    @benjaminp
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    Thank you for the bug report.

    @python-dev
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    Mannequin

    python-dev mannequin commented Jan 2, 2013

    New changeset 0012d4f0ca59 by Benjamin Peterson in branch '2.7':
    ensure the attribute name string is initalized before using it (closes bpo-16839)
    http://hg.python.org/cpython/rev/0012d4f0ca59

    @python-dev python-dev mannequin closed this as completed Jan 2, 2013
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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