From 1c6970fac994be2b1f9e3415e09c07ff01657563 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 13 May 2014 01:32:36 +0200
Subject: [PATCH] Issue #21418: Fix a crash in the builtin function super()
 when called without argument and without current frame (ex: embedded Python).

---
 Misc/NEWS            |  3 +++
 Objects/typeobject.c | 11 +++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index cb4fffbe4db..0b00ecdbadc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ Release date: TBA
 Core and Builtins
 -----------------
 
+- Issue #21418: Fix a crash in the builtin function super() when called without
+  argument and without current frame (ex: embedded Python).
+
 - Issue #21425: Fix flushing of standard streams in the interactive
   interpreter.
 
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 7f59d5da405..ba106a139a7 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -6919,9 +6919,16 @@ super_init(PyObject *self, PyObject *args, PyObject *kwds)
     if (type == NULL) {
         /* Call super(), without args -- fill in from __class__
            and first local variable on the stack. */
-        PyFrameObject *f = PyThreadState_GET()->frame;
-        PyCodeObject *co = f->f_code;
+        PyFrameObject *f;
+        PyCodeObject *co;
         Py_ssize_t i, n;
+        f = PyThreadState_GET()->frame;
+        if (f == NULL) {
+            PyErr_SetString(PyExc_RuntimeError,
+                            "super(): no current frame");
+            return -1;
+        }
+        co = f->f_code;
         if (co == NULL) {
             PyErr_SetString(PyExc_RuntimeError,
                             "super(): no code object");