`mrb_int` may overflow in bit-shifting; fix
@@ -938,7 +938,9 @@ fix_xor(mrb_state *mrb, mrb_value x)
static mrb_value
lshift(mrb_state *mrb, mrb_int val, mrb_int width)
{
- mrb_assert(width > 0);
+ if (width < 0) { /* mrb_int overflow */
+ return mrb_float_value(mrb, INFINITY);
+ }
if (val > 0) {
if ((width > NUMERIC_SHIFT_WIDTH_MAX) ||
(val > (MRB_INT_MAX >> width))) {
@@ -967,7 +969,9 @@ bit_overflow:
static mrb_value
rshift(mrb_int val, mrb_int width)
{
- mrb_assert(width > 0);
+ if (width < 0) { /* mrb_int overflow */
+ return mrb_fixnum_value(0);
+ }
if (width >= NUMERIC_SHIFT_WIDTH_MAX) {
if (val < 0) {
return mrb_fixnum_value(-1);
