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[security] bpo-13617: Reject embedded null characters in wchar* strings. (#2302)

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Based on patch by Victor Stinner.

Add private C API function _PyUnicode_AsUnicode() which is similar to
PyUnicode_AsUnicode(), but checks for null characters.
This commit is contained in:
Serhiy Storchaka 2017-06-28 08:30:06 +03:00 • committed by GitHub
parent 592eda1233
commit f7eae0adfc
22 changed files with 115 additions and 23 deletions
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14
Objects/unicodeobject.c
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@ -4133,6 +4133,20 @@ PyUnicode_AsUnicode(PyObject *unicode)
return PyUnicode_AsUnicodeAndSize(unicode, NULL);
}
const Py_UNICODE *
_PyUnicode_AsUnicode(PyObject *unicode)
{
Py_ssize_t size;
const Py_UNICODE *wstr;
wstr = PyUnicode_AsUnicodeAndSize(unicode, &size);
if (wstr && wcslen(wstr) != (size_t)size) {
PyErr_SetString(PyExc_ValueError, "embedded null character");
return NULL;
}
return wstr;
}
Py_ssize_t
PyUnicode_GetSize(PyObject *unicode)