From 52ebc24487f3d1553c436c3ab9fbf8784379961d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 7 Nov 2009 11:59:16 +0000
Subject: * vm_insnhelper.c (vm_push_frame): get rid of out-of-bounds   access.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25682 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_insnhelper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'vm_insnhelper.c')

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 6d4887024b..0660c7dd03 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -29,7 +29,9 @@ vm_push_frame(rb_thread_t * th, const rb_iseq_t * iseq,
     rb_control_frame_t * const cfp = th->cfp - 1;
     int i;
 
-    CHECK_STACK_OVERFLOW(th->cfp, local_size);
+    if ((void *)(sp + local_size) >= (void *)cfp) {
+	rb_exc_raise(sysstack_error);
+    }
     th->cfp = cfp;
     /* setup vm value stack */
 
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