Skip to content

gh-137103: A better circular check for json.dump() #137104

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 5 commits into
base: main
Choose a base branch
from
Open

gh-137103: A better circular check for json.dump() #137104

Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
f7171eb
A better circular check for json.dump()
aivarsk Jul 25, 2025
af98309
make the diff smaller
aivarsk Jul 26, 2025
429356e
fix
aivarsk Jul 26, 2025
2402f31
smaller diff
aivarsk Jul 26, 2025
088b3e5
better?
aivarsk Jul 26, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
98 changes: 39 additions & 59 deletions Modules/_json.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1522,52 +1522,45 @@ encoder_listencode_obj(PyEncoderObject *s, PyUnicodeWriter *writer,
return rv;
}
else {
PyObject *ident = NULL;
int rc;

if (s->markers != Py_None) {
int has_key;
ident = PyLong_FromVoidPtr(obj);
if (ident == NULL)
return -1;
has_key = PyDict_Contains(s->markers, ident);
if (has_key) {
if (has_key != -1)
rc = Py_ReprEnter(obj);
if (rc != 0) {
if (rc > 0) {
PyErr_SetString(PyExc_ValueError, "Circular reference detected");
Py_DECREF(ident);
return -1;
}
if (PyDict_SetItem(s->markers, ident, obj)) {
Py_DECREF(ident);
return -1;
}
goto bail;
}
}

newobj = PyObject_CallOneArg(s->defaultfn, obj);
if (newobj == NULL) {
Py_XDECREF(ident);
return -1;
goto bail;
}

if (_Py_EnterRecursiveCall(" while encoding a JSON object")) {
Py_DECREF(newobj);
Py_XDECREF(ident);
return -1;
goto bail;
}
rv = encoder_listencode_obj(s, writer, newobj, indent_level, indent_cache);
_Py_LeaveRecursiveCall();

Py_DECREF(newobj);
if (rv) {
_PyErr_FormatNote("when serializing %T object", obj);
Py_XDECREF(ident);
return -1;
goto bail;
}
if (ident != NULL) {
if (PyDict_DelItem(s->markers, ident)) {
Py_XDECREF(ident);
return -1;
}
Py_XDECREF(ident);

if (s->markers != Py_None) {
Py_ReprLeave(obj);
}
return rv;
bail:
if (s->markers != Py_None) {
Py_ReprLeave(obj);
}
return -1;
}
}

Expand Down Expand Up @@ -1649,28 +1642,22 @@ encoder_listencode_dict(PyEncoderObject *s, PyUnicodeWriter *writer,
Py_ssize_t indent_level, PyObject *indent_cache)
{
/* Encode Python dict dct a JSON term */
PyObject *ident = NULL;
PyObject *items = NULL;
PyObject *key, *value;
bool first = true;
int rc;

if (PyDict_GET_SIZE(dct) == 0) {
/* Fast path */
return PyUnicodeWriter_WriteASCII(writer, "{}", 2);
}

if (s->markers != Py_None) {
int has_key;
ident = PyLong_FromVoidPtr(dct);
if (ident == NULL)
goto bail;
has_key = PyDict_Contains(s->markers, ident);
if (has_key) {
if (has_key != -1)
rc = Py_ReprEnter(dct);
if (rc != 0) {
if (rc > 0) {
PyErr_SetString(PyExc_ValueError, "Circular reference detected");
goto bail;
}
if (PyDict_SetItem(s->markers, ident, dct)) {
}
goto bail;
}
}
Expand Down Expand Up @@ -1719,10 +1706,8 @@ encoder_listencode_dict(PyEncoderObject *s, PyUnicodeWriter *writer,
}
}

if (ident != NULL) {
if (PyDict_DelItem(s->markers, ident))
goto bail;
Py_CLEAR(ident);
if (s->markers != Py_None) {
Py_ReprLeave(dct);
}
if (s->indent != Py_None && !first) {
indent_level--;
Expand All @@ -1738,7 +1723,9 @@ encoder_listencode_dict(PyEncoderObject *s, PyUnicodeWriter *writer,

bail:
Py_XDECREF(items);
Py_XDECREF(ident);
if (s->markers != Py_None) {
Py_ReprLeave(dct);
}
return -1;
}

Expand All @@ -1747,11 +1734,10 @@ encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer,
PyObject *seq,
Py_ssize_t indent_level, PyObject *indent_cache)
{
PyObject *ident = NULL;
PyObject *s_fast = NULL;
Py_ssize_t i;
int rc;

ident = NULL;
s_fast = PySequence_Fast(seq, "_iterencode_list needs a sequence");
if (s_fast == NULL)
return -1;
Expand All @@ -1761,17 +1747,11 @@ encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer,
}

if (s->markers != Py_None) {
int has_key;
ident = PyLong_FromVoidPtr(seq);
if (ident == NULL)
goto bail;
has_key = PyDict_Contains(s->markers, ident);
if (has_key) {
if (has_key != -1)
rc = Py_ReprEnter(seq);
if (rc != 0) {
if (rc > 0) {
PyErr_SetString(PyExc_ValueError, "Circular reference detected");
goto bail;
}
if (PyDict_SetItem(s->markers, ident, seq)) {
}
goto bail;
}
}
Expand Down Expand Up @@ -1801,10 +1781,8 @@ encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer,
goto bail;
}
}
if (ident != NULL) {
if (PyDict_DelItem(s->markers, ident))
goto bail;
Py_CLEAR(ident);
if (s->markers != Py_None) {
Py_ReprLeave(seq);
}

if (s->indent != Py_None) {
Expand All @@ -1821,7 +1799,9 @@ encoder_listencode_list(PyEncoderObject *s, PyUnicodeWriter *writer,
return 0;

bail:
Py_XDECREF(ident);
if (s->markers != Py_None) {
Py_ReprLeave(seq);
}
Py_DECREF(s_fast);
return -1;
}
Expand Down
Loading