From 50a70a083d34305a52fac4f5901bff2ead152d68 Mon Sep 17 00:00:00 2001
From: Mark Shannon <mark@hotpy.org>
Date: Sat, 10 Sep 2022 01:12:06 +0100
Subject: [PATCH] GH-96678: Fix undefined behavior in ceval.c (#96708)

---
 .../2022-09-09-13-13-27.gh-issue-96678.vMxi9F.rst         | 1 +
 Python/ceval.c                                            | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2022-09-09-13-13-27.gh-issue-96678.vMxi9F.rst

diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-09-09-13-13-27.gh-issue-96678.vMxi9F.rst b/Misc/NEWS.d/next/Core and Builtins/2022-09-09-13-13-27.gh-issue-96678.vMxi9F.rst
new file mode 100644
index 00000000000..575b52be294
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-09-09-13-13-27.gh-issue-96678.vMxi9F.rst	
@@ -0,0 +1 @@
+Fix case of undefined behavior in ceval.c
diff --git a/Python/ceval.c b/Python/ceval.c
index 7d4543ea03d..20d0e1c50a5 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5532,7 +5532,13 @@ initialize_locals(PyThreadState *tstate, PyFunctionObject *func,
     /* Pack other positional arguments into the *args argument */
     if (co->co_flags & CO_VARARGS) {
         PyObject *u = NULL;
-        u = _PyTuple_FromArraySteal(args + n, argcount - n);
+        if (argcount == n) {
+            u = Py_NewRef(&_Py_SINGLETON(tuple_empty));
+        }
+        else {
+            assert(args != NULL);
+            u = _PyTuple_FromArraySteal(args + n, argcount - n);
+        }
         if (u == NULL) {
             goto fail_post_positional;
         }
-- 
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