[issue10254] unicodedata.normalize('NFC', s) regression

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Attached patch, issue10254.diff, is essentially Martin's code from msg120018 and Part3 tests from NormalizationTest.txt.

Since this bug exposes a buffer overflow condition, I think it qualifies as a security issue, so I am adding 2.6 to versions.

Passing Part3 tests and not crashing on crash.py is probably good enough for a commit, but I don't have a proof that length 20 skipped buffer is always enough.  As the next step, I would like to consider an alternative algorithm that would not require a "skipped" buffer.

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keywords: +patch
stage:  -> commit review
versions: +Python 2.6
Added file: http://bugs.python.org/file20089/issue10254.diff

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<http://bugs.python.org/issue10254>
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