diff options
Diffstat (limited to 'Modules/_bisectmodule.c')
| -rw-r--r-- | Modules/_bisectmodule.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/Modules/_bisectmodule.c b/Modules/_bisectmodule.c index 8cda642..4d0a2e4 100644 --- a/Modules/_bisectmodule.c +++ b/Modules/_bisectmodule.c @@ -21,7 +21,10 @@ internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t return -1; } while (lo < hi) { - mid = (lo + hi) / 2; + /* The (size_t)cast ensures that the addition and subsequent division + are performed as unsigned operations, avoiding difficulties from + signed overflow. (See issue 13496.) */ + mid = ((size_t)lo + hi) / 2; litem = PySequence_GetItem(list, mid); if (litem == NULL) return -1; @@ -123,7 +126,10 @@ internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t h return -1; } while (lo < hi) { - mid = (lo + hi) / 2; + /* The (size_t)cast ensures that the addition and subsequent division + are performed as unsigned operations, avoiding difficulties from + signed overflow. (See issue 13496.) */ + mid = ((size_t)lo + hi) / 2; litem = PySequence_GetItem(list, mid); if (litem == NULL) return -1; |