From 865b850b76a56352abe596bd31311d41a58b37fa Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 5 Mar 2014 15:38:13 +0900
Subject: should check crossing C boudary from resume

---
 mrbgems/mruby-fiber/src/fiber.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index 0dbdad871..f2916e209 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -154,7 +154,13 @@ fiber_resume(mrb_state *mrb, mrb_value self)
   struct mrb_context *c = fiber_check(mrb, self);
   mrb_value *a;
   int len;
+  mrb_callinfo *ci;
 
+  for (ci = c->ci; ci >= c->cibase; ci--) {
+    if (ci->acc < 0) {
+      mrb_raise(mrb, E_ARGUMENT_ERROR, "can't cross C function boundary");
+    }
+  }
   if (c->status == MRB_FIBER_RESUMED) {
     mrb_raise(mrb, E_RUNTIME_ERROR, "double resume");
   }
-- 
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