8000 gh-111178: fix UBSan failures in `Modules/_jsonmodule.c` by picnixz · Pull Request #129781 · python/cpython · GitHub
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gh-111178: fix UBSan failures in Modules/_jsonmodule.c #129781

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Merged
merged 5 commits into from
Feb 17, 2025
Merged

gh-111178: fix UBSan failures in Modules/_jsonmodule.c #129781

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a94db65
fix UBSan failures for `json::PyScannerObject`
picnixz Jan 25, 2025
2f41394
fix UBSan failures for `json::PyEncoderObject`
picnixz Jan 25, 2025
ec3b018
Merge remote-tracking branch 'upstream/main' into fix/ubsan/json-111178
picnixz Feb 7, 2025
e199b8b
Do not use `_` + capital letter in new code as it is also UB.
picnixz Feb 8, 2025
271a75c
Merge branch 'main' into fix/ubsan/json-111178
encukou Feb 17, 2025
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fix UBSan failures for json::PyEncoderObject
  • Loading branch information
@picnixz
picnixz committed Jan 25, 2025
commit 2f4139416ce0c1c6242786e85371fa3cb3600ae9
24 changes: 14 additions & 10 deletions Modules/_json.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ typedef struct _PyEncoderObject {
PyCFunction fast_encode;
} PyEncoderObject;

#define _PyEncoderObject_CAST(op) ((PyEncoderObject *)(op))

static PyMemberDef encoder_members[] = {
{"markers", _Py_T_OBJECT, offsetof(PyEncoderObject, markers), Py_READONLY, "markers"},
{"default", _Py_T_OBJECT, offsetof(PyEncoderObject, defaultfn), Py_READONLY, "default"},
Expand Down Expand Up @@ -88,7 +90,7 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static void
encoder_dealloc(PyObject *self);
static int
encoder_clear(PyEncoderObject *self);
encoder_clear(PyObject *self);
static int
encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer, PyObject *seq, Py_ssize_t indent_level, PyObject *indent_cache);
static int
Expand Down Expand Up @@ -1250,8 +1252,7 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)

if (PyCFunction_Check(s->encoder)) {
PyCFunction f = PyCFunction_GetFunction(s->encoder);
if (f == (PyCFunction)py_encode_basestring_ascii ||
f == (PyCFunction)py_encode_basestring) {
if (f == py_encode_basestring_ascii || f == py_encode_basestring) {
s->fast_encode = f;
}
}
Expand Down Expand Up @@ -1346,12 +1347,13 @@ write_newline_indent(PyUnicodeWriter *writer,


static PyObject *
encoder_call(PyEncoderObject *self, PyObject *args, PyObject *kwds)
encoder_call(PyObject *op, PyObject *args, PyObject *kwds)
{
/* Python callable interface to encode_listencode_obj */
static char *kwlist[] = {"obj", "_current_indent_level", NULL};
PyObject *obj;
Py_ssize_t indent_level;
PyEncoderObject *self = _PyEncoderObject_CAST(op);

if (!PyArg_ParseTupleAndKeywords(args, kwds, "On:_iterencode", kwlist,
&obj, &indent_level))
Expand Down Expand Up @@ -1823,14 +1825,15 @@ encoder_dealloc(PyObject *self)
PyTypeObject *tp = Py_TYPE(self);
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyObject_GC_UnTrack(self);
encoder_clear((PyEncoderObject *)self);
(void)encoder_clear(self);
tp->tp_free(self);
Py_DECREF(tp);
}

static int
encoder_traverse(PyEncoderObject *self, visitproc visit, void *arg)
encoder_traverse(PyObject *op, visitproc visit, void *arg)
{
PyEncoderObject *self = _PyEncoderObject_CAST(op);
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->markers);
Py_VISIT(self->defaultfn);
Expand All @@ -1842,8 +1845,9 @@ encoder_traverse(PyEncoderObject *self, visitproc visit, void *arg)
}

static int
encoder_clear(PyEncoderObject *self)
encoder_clear(PyObject *op)
{
PyEncoderObject *self = _PyEncoderObject_CAST(op);
/* Deallocate Encoder */
Py_CLEAR(self->markers);
Py_CLEAR(self->defaultfn);
Expand Down Expand Up @@ -1877,15 +1881,15 @@ static PyType_Spec PyEncoderType_spec = {

static PyMethodDef speedups_methods[] = {
{"encode_basestring_ascii",
(PyCFunction)py_encode_basestring_ascii,
py_encode_basestring_ascii,
METH_O,
pydoc_encode_basestring_ascii},
{"encode_basestring",
(PyCFunction)py_encode_basestring,
py_encode_basestring,
METH_O,
pydoc_encode_basestring},
{"scanstring",
(PyCFunction)py_scanstring,
py_scanstring,
METH_VARARGS,
pydoc_scanstring},
{NULL, NULL, 0, NULL}
Expand Down
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