GNU bug report logs - #22146
Stack overflow in reftex-parse-all

Previous Next

Full log

Message #49 received at 22146-done <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: David Kastrup <dak <at> gnu.org>
Cc: Nils Kanning <nils <at> kanning.de>, 22146-done <at> debbugs.gnu.org,
 Mosè Giordano <mose <at> gnu.org>
Subject: Re: bug#22146: Stack overflow in reftex-parse-all
Date: Sun, 13 Dec 2015 19:55:22 +0100

David Kastrup <dak <at> gnu.org> 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 [.

Bye,
Tassilo

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.