Bugs item #779964, was opened at 2003-07-29 18:18
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Category: Python
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Conan Brink (conanbrink)
Assigned to: David Abrahams (david_abrahams)
Summary: raw_function with no keywords calls Py_INCREF on NULL
Initial Comment:
In the 1.30.0 release, as well as in the latest CVS, the
following code (using the very example presented in the
documentation for raw_function.hpp) results in a
segfault:
C++:
#include <boost/python/def.hpp>
#include <boost/python/tuple.hpp>
#include <boost/python/dict.hpp>
#include <boost/python/module.hpp>
#include <boost/python/raw_function.hpp>
using namespace boost::python;
tuple raw(tuple args, dict kw)
{
return make_tuple(args, kw);
}
BOOST_PYTHON_MODULE(raw_test)
{
def("raw", raw_function(raw));
}
Python:
>>> from raw_test import *
>>> def pyraw(*args, **kw):
... return (args, kw)
...
>>> pyraw(3, 4, foo = 'bar', baz = 42)
((3, 4), {'foo': 'bar', 'baz': 42})
>>> raw(3, 4, foo = 'bar', baz = 42)
((3, 4), {'foo': 'bar', 'baz': 42})
>>> pyraw(3,4)
((3, 4), {})
>>> raw(3, 4)
Segmentation fault
The problem is that the "keywords" parameter passed to
boost::python::detail::raw_dispatcher's operator() is
NULL. This NULL pointer then gets wrapped in a
borrowed_reference and passed to dict's constructor,
which proceeds to make an attempt to Py_INCREF it.
do_call() from Python/eval.c passes a NULL pointer for
the keyword dictionary in Python releases 2.2.2, 2.2.3,
and 2.3b2. I can't vouch for earlier releases.
Note that the Python version of this function (pyraw,
defined above) receives an empty dict for its keywords
when no keywords are passed, and I would expect the
Boost Python Library to give me the same.
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