diff options
| -rw-r--r-- | Objects/longobject.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Objects/longobject.c b/Objects/longobject.c index 73413dd..4cc080f 100644 --- a/Objects/longobject.c +++ b/Objects/longobject.c @@ -668,10 +668,9 @@ _PyLong_NumBits(PyObject *vv) assert(ndigits == 0 || v->ob_digit[ndigits - 1] != 0); if (ndigits > 0) { digit msd = v->ob_digit[ndigits - 1]; - - result = (ndigits - 1) * PyLong_SHIFT; - if (result / PyLong_SHIFT != (size_t)(ndigits - 1)) + if ((size_t)(ndigits - 1) > PY_SIZE_MAX / (size_t)PyLong_SHIFT) goto Overflow; + result = (size_t)(ndigits - 1) * (size_t)PyLong_SHIFT; do { ++result; if (result == 0) |