From ecc74d76ccf8fe4ca8c32120697d64845c475169 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Sat, 18 Apr 2015 02:24:24 +0200
Subject: [PATCH] eth: drop blocks that are known

---
 eth/handler.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/eth/handler.go b/eth/handler.go
index 858ae2958..065116fd0 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -256,6 +256,12 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
 			RemoteId:      p.ID().String(),
 		})
 
+		// Make sure the block isn't already known. If this is the case simply drop
+		// the message and move on.
+		if self.chainman.HasBlock(hash) {
+			break
+		}
+
 		// Attempt to insert the newly received by checking if the parent exists.
 		// if the parent exists we process the block and propagate to our peers
 		// if the parent does not exists we delegate to the downloader.