[Bug 681790] New: Division by zero in _hb_sanitize_array leads to infinite loop in Firefox caused by web fonts

[Red Hat Bugzilla]

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Summary: Division by zero in _hb_sanitize_array leads to infinite loop in Firefox caused
by web fonts

https://bugzilla.redhat.com/show_bug.cgi?id=681790

           Summary: Division by zero in _hb_sanitize_array leads to
                    infinite loop in Firefox caused by web fonts
           Product: Fedora
           Version: 14
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: unspecified
          Priority: unspecified
         Component: pango
        AssignedTo: behdad(a)fedoraproject.org
        ReportedBy: nmiell(a)gmail.com
         QAContact: extras-qa(a)fedoraproject.org
                CC: behdad(a)fedoraproject.org,
                    fonts-bugs(a)lists.fedoraproject.org
    Classification: Fedora


Description of problem:

Program received signal SIGFPE, Arithmetic exception.
0x000000352121baa1 in _hb_sanitize_array (this=0x7f8536e78fb0,
context=0x7fffda5d5df0) at hb-open-type-private.hh:202
202   bool overflows = len >= ((unsigned int) -1) / record_size;
(gdb) info args
len = 56
record_size = 0
base = 0x7f8536e78fc0 ""
context = <value optimized out>

Version-Release number of selected component (if applicable):
pango-1.28.1-4.fc14.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Visit www.google.com/webfonts in Firefox

Actual results:
Firefox goes into an infinite loop because its SIGFPE handler endlessly
restarts the division instruction.

Expected results:
No SIGFPE in the first place.

Additional info:
firefox-3.6.13-1.fc14.x86_64

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[Bug 681790] Division by zero in _hb_sanitize_array leads to infinite loop in Firefox caused by web fonts

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=681790

Fedora End Of Life <endoflife(a)fedoraproject.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
         Resolution|---                         |WONTFIX
        Last Closed|                            |2012-08-16 08:18:18

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[Bug 681790] Division by zero in _hb_sanitize_array leads to infinite loop in Firefox caused by web fonts

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=681790

--- Comment #1 from Fedora End Of Life <endoflife(a)fedoraproject.org&gt; ---
This message is a notice that Fedora 14 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 14. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained.  At this time, all open bugs with a Fedora 'version'
of '14' have been closed as WONTFIX.

(Please note: Our normal process is to give advanced warning of this 
occurring, but we forgot to do that. A thousand apologies.)

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, feel free to reopen 
this bug and simply change the 'version' to a later Fedora version.

Bug Reporter: Thank you for reporting this issue and we are sorry that 
we were unable to fix it before Fedora 14 reached end of life. If you 
would still like to see this bug fixed and are able to reproduce it 
against a later version of Fedora, you are encouraged to click on 
"Clone This Bug" (top right of this page) and open it against that 
version of Fedora.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events.  Often a 
more recent Fedora release includes newer upstream software that fixes 
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The process we are following is described here: 
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