From 0a1a36b74bdf8da286924a1c9652853b1c46f536 Mon Sep 17 00:00:00 2001
From: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Date: Thu, 28 Oct 2021 23:02:34 +0800
Subject: bpo-44525: Add recursive checks for `CALL_FUNCTION_BUILTIN_O`
 (GH-29271)

---
 Python/ceval.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Python')

diff --git a/Python/ceval.c b/Python/ceval.c
index 4ac0b53dd6..d52ca9c65d 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4742,8 +4742,14 @@ check_eval_breaker:
             STAT_INC(CALL_FUNCTION, hit);
 
             PyCFunction cfunc = PyCFunction_GET_FUNCTION(callable);
+            // This is slower but CPython promises to check all non-vectorcall
+            // function calls.
+            if (_Py_EnterRecursiveCall(tstate, " while calling a Python object")) {
+                goto error;
+            }
             PyObject *arg = POP();
             PyObject *res = cfunc(PyCFunction_GET_SELF(callable), arg);
+            _Py_LeaveRecursiveCall(tstate);
             assert((res != NULL) ^ (_PyErr_Occurred(tstate) != NULL));
 
             /* Clear the stack of the function object. */
-- 
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