bpo-35972: _xxsubinterpreters: Fix potential integer truncation on 32-bit in channel_send() (gh-11822)
diff --git a/Python/pystate.c b/Python/pystate.c
index 4dc3b81..f0b2a67 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -1467,13 +1467,17 @@
static PyObject *
_new_long_object(_PyCrossInterpreterData *data)
{
- return PyLong_FromLongLong((intptr_t)(data->data));
+ return PyLong_FromSsize_t((Py_ssize_t)(data->data));
}
static int
_long_shared(PyObject *obj, _PyCrossInterpreterData *data)
{
- int64_t value = PyLong_AsLongLong(obj);
+ /* Note that this means the size of shareable ints is bounded by
+ * sys.maxsize. Hence on 32-bit architectures that is half the
+ * size of maximum shareable ints on 64-bit.
+ */
+ Py_ssize_t value = PyLong_AsSsize_t(obj);
if (value == -1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
PyErr_SetString(PyExc_OverflowError, "try sending as bytes");