bpo-34441: Fix ABC.__subclasscheck__ crash on classes with invalid __subclasses__ (GH-8835)
The missing NULL check was reported by Svace static analyzer.
(cherry picked from commit cdbf50cba1664f72ae6621a89c324a32fea70377)
Co-authored-by: Alexey Izbyshev <izbyshev@ispras.ru>
diff --git a/Modules/_abc.c b/Modules/_abc.c
index 562a2e6..ce9140f 100644
--- a/Modules/_abc.c
+++ b/Modules/_abc.c
@@ -665,6 +665,9 @@
/* 6. Check if it's a subclass of a subclass (recursive). */
subclasses = PyObject_CallMethod(self, "__subclasses__", NULL);
+ if (subclasses == NULL) {
+ goto end;
+ }
if (!PyList_Check(subclasses)) {
PyErr_SetString(PyExc_TypeError, "__subclasses__() must return a list");
goto end;