bpo-34899: Fix a possible assertion failure due to int_from_bytes_impl() (GH-9705)

The _PyLong_FromByteArray() call in int_from_bytes_impl() was
unchecked.
(cherry picked from commit 7bb9cd0a6766fd3e7b3c1e8f2315304ae192b34c)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

diff --git a/Objects/longobject.c b/Objects/longobject.c
index c3c0949189d85106d29aa581ce9a1a733f3a8158..3864cec97a0a0fd42cd6f7d9e4635fd09e57fce7 100644 (file)
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -5302,7 +5302,7 @@ long_from_bytes(PyTypeObject *type, PyObject *args, PyObject *kwds)
         little_endian, is_signed);
     Py_DECREF(bytes);
 
-    if (type != &PyLong_Type) {
+    if (long_obj != NULL && type != &PyLong_Type) {
         Py_SETREF(long_obj, PyObject_CallFunctionObjArgs((PyObject *)type,
                                                          long_obj, NULL));
     }