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# HG changeset patch
# User Benjamin Peterson <benjamin@python.org>
# Date 1397441438 14400
# Node ID 50c07ed1743da9cd4540d83de0c30bd17aeb41b0
# Parent 218e28a935ab4494d05215c243e2129625a71893
in scan_once, prevent the reading of arbitrary memory when passed a negative index
Bug reported by Guido Vranken.
Index: Python-3.2.5/Lib/json/tests/test_decode.py
===================================================================
--- Python-3.2.5.orig/Lib/test/json_tests/test_decode.py 2014-06-26 18:40:10.825269130 +0200
+++ Python-3.2.5/Lib/test/json_tests/test_decode.py 2014-06-26 18:40:21.962323035 +0200
@@ -60,5 +60,9 @@
msg = 'escape'
self.assertRaisesRegexp(ValueError, msg, self.loads, s)
+ def test_negative_index(self):
+ d = self.json.JSONDecoder()
+ self.assertRaises(ValueError, d.raw_decode, 'a'*42, -50000)
+
class TestPyDecode(TestDecode, PyTest): pass
class TestCDecode(TestDecode, CTest): pass
Index: Python-3.2.5/Modules/_json.c
===================================================================
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -930,7 +930,10 @@ scan_once_unicode(PyScannerObject *s, Py
PyObject *res;
Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
Py_ssize_t length = PyUnicode_GET_SIZE(pystr);
- if (idx >= length) {
+ if (idx < 0)
+ /* Compatibility with Python version. */
+ idx += length;
+ if (idx < 0 || idx >= length) {
PyErr_SetNone(PyExc_StopIteration);
return NULL;
}
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