[3.12] gh-121660: Fix `ga_getitem` by explicitly checking for `NULL` result (GH-12166...

gh-121660: Fix `ga_getitem` by explicitly checking for `NULL` result (GH-121661)
(cherry picked from commit bb802db8cfa35a88582be32fae05fe1cf8f237b1)

Co-authored-by: sobolevn <mail@sobolevn.me>

diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 117b4e8dfb960ae17c80b970a7714b25def62ad3..7f89e68340b66fbba4ad5233e5df813b96764d67 100644 (file)
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -564,6 +564,10 @@ ga_getitem(PyObject *self, PyObject *item)
     }
 
     PyObject *res = Py_GenericAlias(alias->origin, newargs);
+    if (res == NULL) {
+        Py_DECREF(newargs);
+        return NULL;
+    }
     ((gaobject *)res)->starred = alias->starred;
 
     Py_DECREF(newargs);