From 7b36363b8baf0106f55d1ee4f681d1d295674e41 Mon Sep 17 00:00:00 2001
From: Harald Musum <musum@oath.com>
Date: Mon, 11 Dec 2017 08:39:54 +0100
Subject: Only update hash when there is more data

---
 .../java/com/yahoo/vespa/filedistribution/LazyFileReferenceData.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/filedistribution/src/main/java/com/yahoo/vespa/filedistribution/LazyFileReferenceData.java b/filedistribution/src/main/java/com/yahoo/vespa/filedistribution/LazyFileReferenceData.java
index 5e7fd08e52f..1681843a818 100644
--- a/filedistribution/src/main/java/com/yahoo/vespa/filedistribution/LazyFileReferenceData.java
+++ b/filedistribution/src/main/java/com/yahoo/vespa/filedistribution/LazyFileReferenceData.java
@@ -30,7 +30,9 @@ public class LazyFileReferenceData extends FileReferenceData {
         } catch (IOException e) {
             return -1;
         }
-        hasher.update(bb.array(), pos, read);
+        if (read > 0) {
+            hasher.update(bb.array(), pos, read);
+        }
         return read;
     }
 
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