Red Hat Bugzilla – Bug 800167
Bugs found in python-libasyncns-0.7.1-6.fc17 using gcc-with-cpychecker static analyzer
Last modified: 2015-02-17 09:09:13 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-libasyncns-0.7.1-6.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 appears to be a false positive (the intent of the function presumably *is* to delete the query).
Within the category "Reference leaks" the 1 issue reported appears to be a genuine reference leak: PyList_Append(out, tu) adds a new reference to "tu", it doesn't steal the reference, so the code needs a Py_DECREF(tu).
Within the category "Segfaults within error-handling paths" the 3 issues reported appear to be genuine crashers under low-memory conditions, where a memory-allocating function could return NULL.
Within the category "Returning (PyObject*)NULL without setting an exception" the 1 issue reported may or may not be a genuine bug: the checker doesn't know if libasyncns_set_gaierror() sets the thread's exception status.
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 11462291a66c8db693c8884cb84b795bb5988ffb 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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