From 9e13209db1783c48ec19e8b3e606c5a8684ba8b3 Mon Sep 17 00:00:00 2001
From: Jeromy <why@ipfs.io>
Date: Wed, 4 May 2016 10:51:57 -0700
Subject: [PATCH] fix underflow error found by fuzzing

---
 codec.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/codec.go b/codec.go
index e05bbb8..5193d5b 100644
--- a/codec.go
+++ b/codec.go
@@ -70,9 +70,10 @@ func validateBytes(b []byte) (err error) {
 			return err
 		}
 
-		if len(b) < size {
+		if len(b) < size || size < 0 {
 			return fmt.Errorf("invalid value for size")
 		}
+
 		b = b[size:]
 	}