Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

1 files changed, 8 insertions, 4 deletions

diff --git a/Modules/clinic/_cryptmodule.c.h b/Modules/clinic/_cryptmodule.c.h
index 412c6fe8a1..3e536c1709 100644
--- a/Modules/clinic/_cryptmodule.c.h
+++ b/Modules/clinic/_cryptmodule.c.h
@@ -14,25 +14,29 @@ PyDoc_STRVAR(crypt_crypt__doc__,
 "results for a given *word*.");
 
 #define CRYPT_CRYPT_METHODDEF    \
-    {"crypt", (PyCFunction)crypt_crypt, METH_VARARGS, crypt_crypt__doc__},
+    {"crypt", (PyCFunction)crypt_crypt, METH_FASTCALL, crypt_crypt__doc__},
 
 static PyObject *
 crypt_crypt_impl(PyObject *module, const char *word, const char *salt);
 
 static PyObject *
-crypt_crypt(PyObject *module, PyObject *args)
+crypt_crypt(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     const char *word;
     const char *salt;
 
-    if (!PyArg_ParseTuple(args, "ss:crypt",
+    if (!_PyArg_ParseStack(args, nargs, "ss:crypt",
         &word, &salt)) {
         goto exit;
     }
+
+    if (!_PyArg_NoStackKeywords("crypt", kwnames)) {
+        goto exit;
+    }
     return_value = crypt_crypt_impl(module, word, salt);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=8dfc88264e662df4 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=3fd5d3625a6f32fe input=a9049054013a1b77]*/