Add check before calling str_substr(); ref
MODIFY
src/string.c
src/string.c
@@ -1168,8 +1168,11 @@ mrb_str_aref_m(mrb_state *mrb, mrb_value str)
argc = mrb_get_args(mrb, "o|o", &a1, &a2);
if (argc == 2) {
+ mrb_int n1, n2;
+
mrb_regexp_check(mrb, a1);
- return str_substr(mrb, str, mrb_fixnum(a1), mrb_fixnum(a2));
+ mrb_get_args(mrb, "ii", &n1, &n2);
+ return str_substr(mrb, str, n1, n2);
}
if (argc != 1) {
mrb_raisef(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (%S for 1)", mrb_fixnum_value(argc));

Add check before calling str_substr(); ref #3476