[Mono-bugs] [Bug 610587] New: Long perform a regular expression.

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=610587

http://bugzilla.novell.com/show_bug.cgi?id=610587#c0


           Summary: Long perform a regular expression.
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: Other
        OS/Version: Debian Woody
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: kyevstig at mfisoft.ru
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3)
Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729)

Hello,

we found a trouble in using RegularExpression:

our user often input incorrect regexp like "^*8.*", when mono try to matching
this pattern mono use 100% cpu and this continues about 2.5 minutes. So system
stay this time and do not processing request.


test program:
--------------------------------------------
Console.WriteLine(DateTime.Now.ToString());
Regex.Match("888", "^*8.*");
Console.WriteLine(DateTime.Now.ToString());
--------------------------------------------
output:
--------------------------------------------
hp-bl9:~/7# /usr/local/mono2.6.4/bin/mono ./ConsoleApplication1.exe
06/01/2010 15:06:53
06/01/2010 15:09:19
hp-bl9:~/7#


the same problem on  mono 2.4

it's stop all service so i think severity = major

Reproducible: Always

Steps to Reproduce:
1. make program with line Regex.Match("888", "^*8.*");
2. run program
3.
Actual Results:  
program using 100%, and perform about 2,5 minutes.

Expected Results:  
function Regex.Match return false and do it not do long time.

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