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
libssh2-python-0.7.1-4.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 may or may not be a true error: I can't tell from the context
Within the category "Reference leaks" the 30 issues reported seem to stem from the CHECK_RETURN_CODE() macro: in particular, the RAISE_SSH2_ERROR() macro that it uses: in each case, each error-handling path has two reference leaks: that of _exc, and that of the Py_BuildValue result: both of these are built as new references, and nothing DECREFs them. (Also, in each case the calls could fail)
Within the category "Reference count too low within an initialization routine" the 2 issues reported are likely to be inconsequential.
Within the category "Segfaults within error-handling paths" the 14 issues reported appear to be genuine crashers under low-memory conditions, where an earlier function call could return NULL, and nothing checks for it. Many of these relate to the macros mentioned above.
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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