commit 1596fea0a329e1f5e4cce0135724881ca5f1d341
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Oct 05 14:28:56 2018 -0700
committer GitHub <noreply@github.com> Fri Oct 05 14:28:56 2018 -0700
tree a1372a026951b034ed43d02f0a0042230df20dd6
parent d9212200fe8ddb55d73b8231869cfbb32635ba92

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>

Objects/longobject.c

diff --git a/Objects/longobject.c b/Objects/longobject.c
index 269d6cd..59c7efb 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -5270,7 +5270,7 @@
         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));
     }