Red Hat Bugzilla – Bug 809943
Reference leaks in error-handling paths found in python-ldap-2.4.6-2.fc17 using gcc-with-cpychecker static analyzer
Last modified: 2015-02-17 09:12:10 EST
Description of problem:
I've been writing an experimental static analysis tool to detect bugs commonly occurring within C Python extension modules:
I ran the latest version of the tool (in git master; post 0.9) on
python-ldap-2.4.6-2.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):
I've manually reviewed the issues reported by the tool.
Within the category "Reference leaks" the 6 issues reported are all memory leaks in error-handling paths. 5 out of them relate to Py_BuildValue:
the other, in
Error: ob_refcnt of '*result' is 1 too high
is a missing Py_DECREF()
Within the category "Possible reference leaks" the 2 issues reported are probably false positives (does LDAPerr() return NULL?)
Within the category "Returning (PyObject*)NULL without setting an exception" the 19 issues reported are probably false positives, though I can't be sure without more context.
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):
gcc-python-plugin post-0.9 git 796fa7a73adfddb182c2edad70694b5ebca337b9 running the checker in an *f16* chroot
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.
(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)
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