Bug 800143

Summary: Bug found in python-cups-1.9.60-1.fc17 using gcc-with-cpychecker static analyzer
Product: [Fedora] Fedora Reporter: Dave Malcolm <dmalcolm>
Component: python-cupsAssignee: Tim Waugh <twaugh>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: jpopelka, twaugh
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
URL: http://fedorapeople.org/~dmalcolm/gcc-python-plugin/2012-03-05/python-cups-1.9.60-1.fc17/
Whiteboard:
Fixed In Version: python-cups-1.9.61-1.fc17 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-03-13 14:34:40 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On:    
Bug Blocks: 789472    

Description Dave Malcolm 2012-03-05 15:15:44 EST
Description of problem:
I've been writing an experimental static analysis tool to detect bugs commonly occurring within C Python extension modules:
  https://fedorahosted.org/gcc-python-plugin/
  http://gcc-python-plugin.readthedocs.org/en/latest/cpychecker.html
  http://fedoraproject.org/wiki/Features/StaticAnalysisOfPythonRefcounts

I ran the latest version of the tool (in git master; post 0.9) on
python-cups-1.9.60-1.fc17.src.rpm, and it reports various errors.

You can see a list of errors here, triaged into categories (from most significant to least significant):
http://fedorapeople.org/~dmalcolm/gcc-python-plugin/2012-03-05/python-cups-1.9.60-1.fc17/

I've manually reviewed the issue reported by the tool.

Within the category "Reference count too low" the 1 issue reported:
cupsmodule.c:cups_require:ob_refcnt of return value is 1 too low
appears to be a genuine problem: the:
   return Py_None;
should be a
   Py_RETURN_NONE;
otherwise every call to cups_require() will leak a reference to the Py_None singleton.

There may of course be other bugs in my checker tool.

Hope this is helpful; let me know if you need help reading the logs that the tool generates - I know that it could use some improvement.

Version-Release number of selected component (if applicable):
python-cups-1.9.60-1.fc17
gcc-python-plugin post-0.9 git 11462291a66c8db693c8884cb84b795bb5988ffb running the checker in an *f16* chroot
Comment 1 Fedora Update System 2012-03-06 07:00:17 EST
python-cups-1.9.61-1.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/python-cups-1.9.61-1.fc17
Comment 2 Fedora Update System 2012-03-07 02:21:55 EST
Package python-cups-1.9.61-1.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing python-cups-1.9.61-1.fc17'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-3176/python-cups-1.9.61-1.fc17
then log in and leave karma (feedback).
Comment 3 Fedora Update System 2012-03-13 14:34:40 EDT
python-cups-1.9.61-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.