Red Hat Bugzilla – Bug 809292
Bugs found in python-arm4-1.2-5.fc17 using gcc-with-cpychecker static analyzer
Last modified: 2015-02-17 09:11:43 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-arm4-1.2-5.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 count too low" the 1 issue reported is a genuine bug: the code should use Py_RETURN_NONE.
Within the category "Reference count too low within an initialization routine" the 16 issues reported are inconsequential.
Within the category "Reference leak within initialization" the 1 issue reported is inconsequential
Within the category "Segfaults within error-handling paths" the 4 issues reported appear to be genuine crashers under low-memory conditions
Within the category "Possible reference leaks" the 3 issues reported appear to be genuine memory leaks in the error-handling paths (missing DECREFs).
Within the category "Returning (PyObject*)NULL without setting an exception" the 28 issues reported are probably all false positives (the checker doesn't know about set_arm_error).
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 d578ee0e46d93647d0f94502784f890c38139d60 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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