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This queue is for tickets about the PDF-API2 CPAN distribution.

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The Basics
Id: 41049
Status: resolved
Priority: 0/
Queue: PDF-API2

People
Owner: Nobody in particular
Requestors: sfetisov [...] stratify.com
Cc:
AdminCc:

Bug Information
Severity: (no value)
Broken in: (no value)
Fixed in: 2.021



CC: <alfredreibenschuh [...] gmx.net>
Subject: stack overflow in the PDF::API2
Date: Tue, 18 Nov 2008 16:23:37 -0800
To: <bug-PDF-API2 [...] rt.cpan.org>
From: "Sergei Fetisov" <sfetisov [...] stratify.com>
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Dear Alfred, We are using the PDF::API2 package with ActiveState Perl 5.8 under Windows XP/2003. This is an extremely helpful package. Unfortunately, recently I found an issue. There is a non optimized regular expression at PDF::API2::Basic::PDF::File package, line 648: $str =~ /^((?:[^\\()]|\\[^()])*)(.*)/so; Perl5.8 has a recursion code in the regexp engine. The pattern could contain of a huge number of matches and invoke a deep recursion. So the regular expression engine is running out of stack space and it causes segmentation fault. For example, it happens when PDF file contains of the really big metadata (e.g. 30000 characters in the Keywords field). I think the next regular expression could be used instead and it should resolve the issue: $str =~ /^(\\?[^\\()]+)(.*)/so; We are going to update the Perl version up to 5.10 in the future and it has to fix the problem too. In the meanwhile, we would like to let you know about the issue and it will be great if you have a chance to fix it. Thank you, Sergei Fetisov Senior Member of Technical Staff Stratify, an Iron Mountain Company 501 Ellis Street Mountain View, CA 94043 www.stratify.com Phone: 650-963-3989 Fax: 650-988-2159 Show quoted text
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I've rewritten this section of the code in changeset 9c94b7cf1700 (see the BitBucket repository) in such a way that this issue should be resolved. Since there aren't any tests exercising this code in a significant way, I'll try this version out at my work for a while before releasing it, to see if any new errors pop up.


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