Prohibit too deep `mrb_funcall()` recursion; ref
`mrb_funcall()` recursion can cause stack overflow easily,
so recursion depth is now limited to MRB_FUNCALL_DEPTH_MAX,
which default value is 512.
MODIFY
src/vm.c
src/vm.c
@@ -40,6 +40,11 @@ void abort(void);
#define MRB_STACK_GROWTH 128
#endif
+/* Maximum mrb_funcall() depth. Should be set lower on memory constrained systems. */
+#ifndef MRB_FUNCALL_DEPTH_MAX
+#define MRB_FUNCALL_DEPTH_MAX 512
+#endif
+
/* Maximum stack depth. Should be set lower on memory constrained systems.
The value below allows about 60000 recursive calls in the simplest case. */
#ifndef MRB_STACK_MAX
@@ -386,6 +391,9 @@ mrb_funcall_with_block(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc
undef = mid;
argc++;
}
+ if (mrb->c->ci - mrb->c->cibase > MRB_FUNCALL_DEPTH_MAX) {
+ mrb_exc_raise(mrb, mrb_obj_value(mrb->stack_err));
+ }
ci = cipush(mrb);
ci->mid = mid;
ci->proc = p;

Prohibit too deep `mrb_funcall()` recursion; ref #3421

`mrb_funcall()` recursion can cause stack overflow easily,
so recursion depth is now limited to MRB_FUNCALL_DEPTH_MAX,
which default value is 512.