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gh-108308: config_dict_get() uses PyDict_GetItemRef() #108371

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Aug 23, 2023
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25 changes: 19 additions & 6 deletions Python/initconfig.c
Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
#include "Python.h"
#include "pycore_dict.h" // _PyDict_GetItemStringWithError()
#include "pycore_fileutils.h" // _Py_HasFileSystemDefaultEncodeErrors
#include "pycore_getopt.h" // _PyOS_GetOpt()
#include "pycore_initconfig.h" // _PyStatus_OK()
Expand Down Expand Up @@ -1065,8 +1064,11 @@ _PyConfig_AsDict(const PyConfig *config)
static PyObject*
config_dict_get(PyObject *dict, const char *name)
{
PyObject *item = _PyDict_GetItemStringWithError(dict, name);
if (item == NULL && !PyErr_Occurred()) {
PyObject *item;
if (PyDict_GetItemStringRef(dict, name, &item) < 0) {
return NULL;
}
if (item == NULL) {
PyErr_Format(PyExc_ValueError, "missing config key: %s", name);
return NULL;
}
Expand Down Expand Up @@ -1096,6 +1098,7 @@ config_dict_get_int(PyObject *dict, const char *name, int *result)
return -1;
}
int value = _PyLong_AsInt(item);
Py_DECREF(item);
if (value == -1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_TypeError)) {
config_dict_invalid_type(name);
Expand All @@ -1118,6 +1121,7 @@ config_dict_get_ulong(PyObject *dict, const char *name, unsigned long *result)
return -1;
}
unsigned long value = PyLong_AsUnsignedLong(item);
Py_DECREF(item);
if (value == (unsigned long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_TypeError)) {
config_dict_invalid_type(name);
Expand All @@ -1140,27 +1144,33 @@ config_dict_get_wstr(PyObject *dict, const char *name, PyConfig *config,
if (item == NULL) {
return -1;
}

PyStatus status;
if (item == Py_None) {
status = PyConfig_SetString(config, result, NULL);
}
else if (!PyUnicode_Check(item)) {
config_dict_invalid_type(name);
return -1;
goto error;
}
else {
wchar_t *wstr = PyUnicode_AsWideCharString(item, NULL);
if (wstr == NULL) {
return -1;
goto error;
}
status = PyConfig_SetString(config, result, wstr);
PyMem_Free(wstr);
}
if (_PyStatus_EXCEPTION(status)) {
PyErr_NoMemory();
return -1;
goto error;
}
Py_DECREF(item);
return 0;

error:
Py_DECREF(item);
return -1;
}


Expand All @@ -1174,6 +1184,7 @@ config_dict_get_wstrlist(PyObject *dict, const char *name, PyConfig *config,
}

if (!PyList_CheckExact(list)) {
Py_DECREF(list);
config_dict_invalid_type(name);
return -1;
}
Expand Down Expand Up @@ -1207,10 +1218,12 @@ config_dict_get_wstrlist(PyObject *dict, const char *name, PyConfig *config,
goto error;
}
_PyWideStringList_Clear(&wstrlist);
Py_DECREF(list);
return 0;

error:
_PyWideStringList_Clear(&wstrlist);
Py_DECREF(list);
return -1;
}

Expand Down