buggrep - Bugs: bug #36842, grep -P dumps when using large...

 
 

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bug #36842: grep -P dumps when using large regex, version 2.5.1

Submitted by:  Robert Klima <robertklima>
Submitted on:  Fri 13 Jul 2012 03:39:03 PM UTC  
 
Category: NoneSeverity: 3 - Normal
Item Group: NoneStatus: None
Privacy: PublicAssigned to: None
Open/Closed: Open

Fri 13 Jul 2012 03:39:03 PM UTC, original submission:

This causes grep to dump:

klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) x=2; /* return
value not used */' ) | grep -P
'(?s)if\s[(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()](?#innerpart)[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)]\s((?#a_comment)\s[/][]([^]|[][^/])[][/]\s);'
Aborted (core dumped)

remove these three chars "x=2" and it works:

klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) ; /* return
value not used */' ) | grep -P
'(?s)if\s[(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()]([^()][(][^()](?#innerpart)[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)][^()])[^()][)]\s((?#a_comment)\s[/][]([^]|[][^/])[][/]\s);'
if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw, sizeof( iVar->hw ) - 1,
pcx->iniFile )) ; /* return value not used */

klr@vwglnx02:~> grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Explanation of the regex:
The regex is a straight forward aproach to check for balanced parantheses in
C-code and then to check whether there is an if-statement or not (empty
if-statement).
It is necessary to code such a complex regex like this as regex normally cannot
be used to deal with balanced parantheses.

It even happens here:

klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) x=2; /* return
value not used */' ) | grep -P
'(?s)if\s[(][^()]([^()][(][^()]([^()][(][^()](?#innerpart)[^()][)][^()])[^()][)][^()])[^()]*[)];'
Aborted (core dumped)

Robert Klima, Dev. Manager, UC4 Software Inc.

Robert Klima <robertklima>

 

No files currently attached

 

Depends on the following items: None found

Items that depend on this one: None found

 

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  • -unavailable- added by robertklima (Submitted the item)
  • -unavailable- added by robertklima
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    Follows 1 latest change.

    Date Changed By Updated Field Previous Value => Replaced By
    Fri 13 Jul 2012 03:39:03 PM UTCrobertklimaCarbon-Copy-=>Added -unavailable-

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