New submission from Dan Snider <[email protected]>:
New to both C and the CPython api so I'm not sure what compiler details matter
but this is with VS14 and default compile parameters on windows 10 with 32bit
Python.
The following function:
static PyObject *spam(PyObject *module) {
digit w = 9;
int x = 9;
long y = 9;
int32_t z = 9;
return Py_BuildValue("(HIK)(lll)(LLL)", w,w,w,x,y,z,x,y,z);
}
returns:
>>> spam()
((9, 9, 38654705673), (9, 9, 9), (38654705673, 438244858264171835, 6133859984))
Above was the most I could fit in a single Py_BuildValue call without causing a
crash (it instantly crashes if "O" or "N" fields are present). I believe this
happens because the ints are being upcasted as pointers, which is undefined
behavior.
----------
components: Interpreter Core, Windows
messages: 315300
nosy: bup, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Py_Build value is causing crashes with the "L" and "K" format characters
when upcasting sub 64-bit integer types
type: crash
versions: Python 3.6
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Python tracker <[email protected]>
<https://bugs.python.org/issue33279>
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