1 files changed, 6 insertions, 0 deletions
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 48bd5dc394..7c02351a46 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -4630,6 +4630,12 @@ split_py_long_to_s_and_ns(PyObject *py_long, time_t *s, long *ns)
     divmod = PyNumber_Divmod(py_long, billion);
     if (!divmod)
         goto exit;
+    if (!PyTuple_Check(divmod) || PyTuple_GET_SIZE(divmod) != 2) {
+        PyErr_Format(PyExc_TypeError,
+                     "%.200s.__divmod__() must return a 2-tuple, not %.200s",
+                     Py_TYPE(py_long)->tp_name, Py_TYPE(divmod)->tp_name);
+        goto exit;
+    }
     *s = _PyLong_AsTime_t(PyTuple_GET_ITEM(divmod, 0));
     if ((*s == -1) && PyErr_Occurred())
         goto exit;