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-rw-r--r--eth/handler.go5
-rw-r--r--eth/sync.go1
2 files changed, 6 insertions, 0 deletions
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)
}
diff --git a/eth/sync.go b/eth/sync.go
index b0653acf9..8784b225d 100644
--- a/eth/sync.go
+++ b/eth/sync.go
@@ -183,6 +183,7 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
// The only scenario where this can happen is if the user manually (or via a
// bad block) rolled back a fast sync node below the sync point. In this case
// however it's safe to reenable fast sync.
+ atomic.StoreUint32(&pm.fastSync, 1)
mode = downloader.FastSync
}
if err := pm.downloader.Synchronise(peer.id, pHead, pTd, mode); err != nil {