bpo-42814: Fix undefined behavior in Objects/genericaliasobject.c (GH-24073)

In is_typing_name(), va_end() is not always called before the
function returns.  It is undefined behavior to call va_start()
without also calling va_end().

1 files changed, 1 insertions, 1 deletions

diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 4cc82ff..8fae83b 100644
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -173,6 +173,7 @@ is_typing_name(PyObject *obj, int num, ...)
             break;
         }
     }
+    va_end(names);
     if (!hit) {
         return 0;
     }
@@ -184,7 +185,6 @@ is_typing_name(PyObject *obj, int num, ...)
         && _PyUnicode_EqualToASCIIString(module, "typing");
     Py_DECREF(module);
     
-    va_end(names);
     return res;
 }