From 03c849338f5fb0efd91b2071f4cedf92bb7bcd55 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 11 Apr 2017 01:51:25 +0900
Subject: Fiber#yield should check C function boundary; fix #3582

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

diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index 232c925d3..b9d4ccdcc 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -326,6 +326,7 @@ mrb_fiber_yield(mrb_state *mrb, mrb_int len, const mrb_value *a)
     mrb_raise(mrb, E_FIBER_ERROR, "can't yield from root fiber");
   }
 
+  fiber_check_cfunc(mrb, c);
   c->prev->status = MRB_FIBER_RUNNING;
   c->status = MRB_FIBER_SUSPENDED;
   mrb->c = c->prev;
-- 
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