Fix a crasher where Python code managed to infinitely recurse in C code without
ever going back out to Python code in PyObject_Call(). Required introducing a
static RuntimeError instance so that normalizing an exception there is no
reliance on a recursive call that would put the exception system over the
recursion check itself.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index f7a3bfe..7378e0d 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1857,7 +1857,11 @@
ternaryfunc call;
if ((call = func->ob_type->tp_call) != NULL) {
- PyObject *result = (*call)(func, arg, kw);
+ PyObject *result;
+ if (Py_EnterRecursiveCall(" while calling a Python object"))
+ return NULL;
+ result = (*call)(func, arg, kw);
+ Py_LeaveRecursiveCall();
if (result == NULL && !PyErr_Occurred())
PyErr_SetString(
PyExc_SystemError,