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xml.etree.ElementTree fails to parse a document (regression) #75484

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VyacheslavRafalskiy mannequin opened this issue Aug 29, 2017 · 3 comments
Closed

xml.etree.ElementTree fails to parse a document (regression) #75484

VyacheslavRafalskiy mannequin opened this issue Aug 29, 2017 · 3 comments
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@serhiy-storchaka
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3.7 (EOL) end of life topic-XML type-bug An unexpected behavior, bug, or error

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@VyacheslavRafalskiy
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VyacheslavRafalskiy mannequin commented Aug 29, 2017

BPO 31303
Nosy @vstinner, @serhiy-storchaka
Superseder
  • bpo-31170: Update to expat 2.2.4 (expat: utf8_toUtf8 cannot properly handle exhausting buffer)
    		•
    Files
  • bad_file.xml
  • bad_file.xml
    		•

    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/serhiy-storchaka'
closed_at = <Date 2017-08-30.05:15:12.619>
created_at = <Date 2017-08-29.17:45:53.331>
labels = ['expert-XML', 'type-bug', '3.7']
title = 'xml.etree.ElementTree fails to parse a document (regression)'
updated_at = <Date 2017-08-30.05:15:12.566>
user = 'https://bugs.python.org/VyacheslavRafalskiy'

    bugs.python.org fields:

    activity = <Date 2017-08-30.05:15:12.566>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2017-08-30.05:15:12.619>
closer = 'serhiy.storchaka'
components = ['XML']
creation = <Date 2017-08-29.17:45:53.331>
creator = 'Vyacheslav.Rafalskiy'
dependencies = []
files = ['47108', '47109']
hgrepos = []
issue_num = 31303
keywords = []
message_count = 3.0
messages = ['300996', '300997', '301010']
nosy_count = 3.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'Vyacheslav.Rafalskiy']
pr_nums = []
priority = 'critical'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '31170'
type = 'behavior'
url = 'https://bugs.python.org/issue31303'
versions = ['Python 3.6', 'Python 3.7']
    @VyacheslavRafalskiy
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    VyacheslavRafalskiy mannequin commented Aug 29, 2017

    In Python 3.5.4 and 3.6.2, both on Windows and Linux, parsing a manifestly correct xml file like:

    xml.etree.ElementTree.parse('bad_file.xml')

    raises:
    UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 1023: invalid continuation byte

    Any other Python version I tried works fine, including 2.7.13, 3.5.2 ...

    @VyacheslavRafalskiy VyacheslavRafalskiy mannequin added type-crash A hard crash of the interpreter, possibly with a core dump topic-XML labels Aug 29, 2017
    @serhiy-storchaka serhiy-storchaka added the 3.7 (EOL) end of life label Aug 29, 2017
    @serhiy-storchaka serhiy-storchaka self-assigned this Aug 29, 2017
    @serhiy-storchaka serhiy-storchaka added type-bug An unexpected behavior, bug, or error and removed type-crash A hard crash of the interpreter, possibly with a core dump labels Aug 29, 2017
    @serhiy-storchaka
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    Simpler reproducer:

    >>> import xml.etree.ElementTree
>>> xml.etree.ElementTree.XML(b'<key attr="' + b'x'*1023 + b'\xc3\xa0&quot;"/>')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/xml/etree/ElementTree.py", line 1315, in XML
    parser.feed(text)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 1023: invalid continuation byte

    Seems this is a regression in the Expat library.

    @serhiy-storchaka
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    This is a duplicate of bpo-31170. Updating expat to 2.2.4 fixes this issue.

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