From 5465e58749ecf553839484f4a41ca94a1621bbb8 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Tue, 14 Feb 2017 02:19:31 +1300
Subject: Handle empty AT2000 message (fix #2662)

---
 src/org/traccar/protocol/At2000ProtocolDecoder.java | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/org/traccar/protocol/At2000ProtocolDecoder.java')

diff --git a/src/org/traccar/protocol/At2000ProtocolDecoder.java b/src/org/traccar/protocol/At2000ProtocolDecoder.java
index 00973f2aa..f990e05c2 100644
--- a/src/org/traccar/protocol/At2000ProtocolDecoder.java
+++ b/src/org/traccar/protocol/At2000ProtocolDecoder.java
@@ -102,6 +102,10 @@ public class At2000ProtocolDecoder extends BaseProtocolDecoder {
                 return null;
             }
 
+            if (buf.capacity() <= BLOCK_LENGTH) {
+                return null; // empty message
+            }
+
             byte[] data = new byte[buf.capacity() - BLOCK_LENGTH];
             buf.readBytes(data);
             buf = ChannelBuffers.wrappedBuffer(ByteOrder.LITTLE_ENDIAN, cipher.update(data));
-- 
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