From 0df69faa6e4096d2d0d50c3c4384fe122e94c03e Mon Sep 17 00:00:00 2001
From: Filippo Valsorda <filippo@cloudflare.com>
Date: Wed, 5 Aug 2015 00:18:02 +0100
Subject: [PATCH] packStructValue: fix a overflow in NSEC packing

---
 msg.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/msg.go b/msg.go
index ffc0733c..676bbd7e 100644
--- a/msg.go
+++ b/msg.go
@@ -785,7 +785,7 @@ func packStructValue(val reflect.Value, msg []byte, off int, compression map[str
 					}
 					length = (t - window*256) / 8
 					bit := t - (window * 256) - (length * 8)
-					if off+2+int(length) > lenmsg {
+					if off+2+int(length)+1 > lenmsg {
 						return lenmsg, &Error{err: "overflow packing nsecx bitmap"}
 					}