Issue #18561: Skip name in ctypes' _build_callargs() if name is NULL.

CID 486199

Misc/NEWS

@@ -54,6 +54,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #18561: Skip name in ctypes' _build_callargs() if name is NULL.
+
 - Issue #18559: Fix NULL pointer dereference error in _pickle module
 
 - Issue #18556: Check the return value of a PyUnicode_AsWideChar() call in

Modules/_ctypes/_ctypes.c

@@ -3453,7 +3453,7 @@ _get_arg(int *pindex, PyObject *name, PyObject *defval, PyObject *inargs, PyObje
         Py_INCREF(v);
         return v;
     }
-    if (kwds && (v = PyDict_GetItem(kwds, name))) {
+    if (kwds && name && (v = PyDict_GetItem(kwds, name))) {
         ++*pindex;
         Py_INCREF(v);
         return v;