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gh-89653: Add assertions on PyUnicode_READ() index #92883

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Merged
vstinner merged 1 commit into from
May 17, 2022
Merged

gh-89653: Add assertions on PyUnicode_READ() index #92883

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10 changes: 9 additions & 1 deletion Include/cpython/unicodeobject.h
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Original file line number Diff line number Diff line change
Expand Up @@ -304,6 +304,7 @@ static inline Py_ssize_t PyUnicode_GET_LENGTH(PyObject *op) {
static inline void PyUnicode_WRITE(int kind, void *data,
Py_ssize_t index, Py_UCS4 value)
{
assert(index >= 0);
if (kind == PyUnicode_1BYTE_KIND) {
assert(value <= 0xffU);
_Py_STATIC_CAST(Py_UCS1*, data)[index] = _Py_STATIC_CAST(Py_UCS1, value);
Expand All @@ -329,6 +330,7 @@ static inline void PyUnicode_WRITE(int kind, void *data,
static inline Py_UCS4 PyUnicode_READ(int kind,
const void *data, Py_ssize_t index)
{
assert(index >= 0);
if (kind == PyUnicode_1BYTE_KIND) {
return _Py_STATIC_CAST(const Py_UCS1*, data)[index];
}
Expand All @@ -350,7 +352,13 @@ static inline Py_UCS4 PyUnicode_READ(int kind,
cache kind and use PyUnicode_READ instead. */
static inline Py_UCS4 PyUnicode_READ_CHAR(PyObject *unicode, Py_ssize_t index)
{
int kind = PyUnicode_KIND(unicode);
int kind;

assert(index >= 0);
// Tolerate reading the NUL character at str[len(str)]
assert(index <= PyUnicode_GET_LENGTH(unicode));

kind = PyUnicode_KIND(unicode);
if (kind == PyUnicode_1BYTE_KIND) {
return PyUnicode_1BYTE_DATA(unicode)[index];
}
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