Issue #7819: Check sys.call_tracing() arguments types.

py3k was already patched by issue #3661.

Lib/test/test_sys.py

@@ -433,6 +433,10 @@ class SysModuleTest(unittest.TestCase):
         out = p.communicate()[0].strip()
         self.assertEqual(out, '?')
 
+    def test_call_tracing(self):
+        self.assertEqual(sys.call_tracing(str, (2,)), "2")
+        self.assertRaises(TypeError, sys.call_tracing, str, 2)
+
 
 class SizeofTest(unittest.TestCase):
 

Misc/NEWS

@@ -12,6 +12,8 @@ What's New in Python 2.7 alpha 3?
 Core and Builtins
 -----------------
 
+- Issue #7819: Check sys.call_tracing() arguments types.
+
 - Issue #7788: Fix an interpreter crash produced by deleting a list
   slice with very large step value.
 

Python/sysmodule.c

@@ -840,7 +840,7 @@ static PyObject *
 sys_call_tracing(PyObject *self, PyObject *args)
 {
 	PyObject *func, *funcargs;
-	if (!PyArg_UnpackTuple(args, "call_tracing", 2, 2, &func, &funcargs))
+	if (!PyArg_ParseTuple(args, "OO!:call_tracing", &func, &PyTuple_Type, &funcargs))
 		return NULL;
 	return _PyEval_CallTracing(func, funcargs);
 }