[issue35028] Off by one error in cgi.FieldStorage(max_num_fields)

[Matthew Belisle]

New submission from Matthew Belisle <matthew.belisle at workiva.com>:

The cgi.FieldStorage class added in https://github.com/python/cpython/pull/9660 has an off by one error in the logic for recursively nested objects. The problem is that sub_max_num_fields should be initialized outside of the while loop, not inside of it. Adding a unit test to cover this case.

Note: This problem does not exist in the 2.7 backport in https://github.com/python/cpython/pull/9969.

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components: Library (Lib)
messages: 328060
nosy: Matthew Belisle
priority: normal
severity: normal
status: open
title: Off by one error in cgi.FieldStorage(max_num_fields)
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35028>
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