From afdd23b5cab227ae6edef3d78ec74b05c7872b55 Mon Sep 17 00:00:00 2001
From: Péter Szilágyi <peterke@gmail.com>
Date: Fri, 26 May 2017 16:04:12 +0300
Subject: eth: don't import propagated blocks during fastsync

---
 eth/handler.go | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'eth/handler.go')

diff --git a/eth/handler.go b/eth/handler.go
index 16e371227..8c2f5660d 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -171,6 +171,11 @@ func NewProtocolManager(config *params.ChainConfig, mode downloader.SyncMode, ne
 		return blockchain.CurrentBlock().NumberU64()
 	}
 	inserter := func(blocks types.Blocks) (int, error) {
+		// If fast sync is running, deny importing weird blocks
+		if atomic.LoadUint32(&manager.fastSync) == 1 {
+			log.Warn("Discarded bad propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
+			return 0, nil
+		}
 		atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
 		return manager.blockchain.InsertChain(blocks)
 	}
-- 
cgit