py/objint: Fix left-shift overflow in checking for large int.

8 years ago · eaa77455c3
1 changed files with 1 additions and 1 deletions
--- a/py/objint.c
+++ b/py/objint.c
@ -383,7 +383,7 @@ STATIC mp_obj_t int_from_bytes(size_t n_args, const mp_obj_t *args) {

    #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
    // If result guaranteedly fits in small int, use that
-    if (!MP_SMALL_INT_FITS(1 << (bufinfo.len * 8 - 1))) {
+    if (bufinfo.len >= sizeof(mp_uint_t) || !MP_SMALL_INT_FITS(1 << (bufinfo.len * 8 - 1))) {
        return mp_obj_int_from_bytes_impl(args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little), bufinfo.len, bufinfo.buf);
    } else
    #endif