bpo-29876: fix DECREF for NULL value in subelement() (GH-760)

diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index 7a0aeda63cf3cc42031b0dd430c40038424ddc9d..94dc5b7ca35e334a09625974d332a6f409a6e074 100644 (file)
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -524,8 +524,9 @@ subelement(PyObject* self, PyObject* args, PyObject* kw)
     }
 
     elem = element_new(tag, attrib);
-
     Py_DECREF(attrib);
+    if (elem == NULL)
+        return NULL;
 
     if (element_add_subelement(parent, elem) < 0) {
         Py_DECREF(elem);