From 7e4731655fecd953d3a5f8830267be6e79ab3b00 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 26 May 2017 01:24:28 +0900
Subject: Fixed off-by-one error in `fiber_switch()`; ref #3641

---
 mrbgems/mruby-fiber/src/fiber.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index bc1d82bbc..3c3630a61 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -190,7 +190,7 @@ fiber_switch(mrb_state *mrb, mrb_value self, mrb_int len, const mrb_value *a, mr
   if (c->status == MRB_FIBER_CREATED) {
     mrb_value *b, *e;
 
-    if (len > c->stend - c->stack) {
+    if (len >= c->stend - c->stack) {
       mrb_raise(mrb, E_FIBER_ERROR, "too many arguments to fiber");
     }
     b = c->stack+1;
-- 
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