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Bug 821405 - Regular expression compiler miscounts capturing parenthesis
Summary: Regular expression compiler miscounts capturing parenthesis
Alias: None
Product: Fedora
Classification: Fedora
Component: perl
Version: 15
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Marcela Mašláňová
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2012-05-14 11:46 UTC by Petr Pisar
Modified: 2012-05-31 00:55 UTC (History)
9 users (show)

Fixed In Version: perl-5.12.4-166.fc15
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-05-31 00:55:22 UTC

Attachments (Terms of Use)
Reproducer (deleted)
2012-05-14 11:49 UTC, Petr Pisar
no flags Details
Fix ported to 5.12.4 (deleted)
2012-05-14 12:41 UTC, Petr Pisar
no flags Details | Diff

Description Petr Pisar 2012-05-14 11:46:58 UTC
perl-5.12.4 exhibits this problem:

use strict; use warnings;
$_ = 'aaa x=${ \$x } bbb a=@a=@{ \@a } ccc';
   (?|   # re-use $1, $2 etc in each alternation
     | ( \{
              (?> \\.
                  | [^\{\}\\]++
                  | \{ (?0) \}

$ rpm -q perl
$ ./5_12_heap_corruption 
*** glibc detected *** /usr/bin/perl: free(): invalid next size (fast): 0x0000000000a722d0 ***
Neoprávněný přístup do paměti (SIGSEGV)

This has been fixed in:

commit fd4be6f07df0e6a021290ef721c5d73550e0248c
Author: Father Chrysostomos <>
Date:   Fri Feb 25 20:45:08 2011 -0800

The only affected Fedora release is F15.

Comment 1 Petr Pisar 2012-05-14 11:49:16 UTC
Created attachment 584345 [details]

Comment 2 Petr Pisar 2012-05-14 12:41:26 UTC
Created attachment 584354 [details]
Fix ported to 5.12.4

Comment 3 Fedora Update System 2012-05-14 13:12:27 UTC
perl-5.12.4-166.fc15 has been submitted as an update for Fedora 15.

Comment 4 Fedora Update System 2012-05-15 23:26:51 UTC
Package perl-5.12.4-166.fc15:
* should fix your issue,
* was pushed to the Fedora 15 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing perl-5.12.4-166.fc15'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 5 Fedora Update System 2012-05-31 00:55:22 UTC
perl-5.12.4-166.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

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