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bug#22146: Stack overflow in reftex-parse-all

From: Tassilo Horn
Subject: bug#22146: Stack overflow in reftex-parse-all
Date: Sun, 13 Dec 2015 19:55:22 +0100
User-agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.0.50 (gnu/linux)

David Kastrup <address@hidden> writes:

>> Isn't the syntax "\\[[^]]\\{0,1000\\}\\<label"?  I tried going up to
>> a maximum of 30000 and it still didn't overflow, so I think that's an
>> appropriate fix (say, maybe 2000 instead of 1000 to be extra safe).
>> Feel free to change `reftex-label-regexps' accordingly.
>> Interestingly, "x\\{0,40000\\}" gives an error:
>>   (invalid-regexp "Invalid content of \\{\\}")
>> So there seems to be a (pretty random) limit...
> I'd guess that the regexp library translates this into a "short", so
> the limit would be SHORT_MAX, namely 32767.

(re-search-forward "x\\{0,32767\\}") => works
(re-search-forward "x\\{0,32768\\}") => error

Yup, of course you're right.

Anyway, I'm closing this bug with the recent emacs/reftex commit which
looks at a label=... at most 2000 chars after the opening [.


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