[issue29990] Range checking in GB18030 decoder

[Ma Lin]

Ma Lin added the comment:

This is a very trivial bug, it's hard to imagine a scene that someone trying to decode those 8630 illegal 4-byte sequences with GB18030 decoder.
And I think this bug can't lead to security vulnerabilities.

As far as I can see, GB2312/GBK/GB18030 codecs are bugfree except this bug, of course maybe I'm wrong.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29990>
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