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-rw-r--r--eth/handler.go21
1 files changed, 16 insertions, 5 deletions
diff --git a/eth/handler.go b/eth/handler.go
index e6c547c02..d72185dd3 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -17,6 +17,7 @@
package eth
import (
+ "encoding/json"
"errors"
"fmt"
"math"
@@ -371,14 +372,24 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
}
case query.Origin.Hash != (common.Hash{}) && !query.Reverse:
// Hash based traversal towards the leaf block
- if header := pm.blockchain.GetHeaderByNumber(origin.Number.Uint64() + query.Skip + 1); header != nil {
- if pm.blockchain.GetBlockHashesFromHash(header.Hash(), query.Skip+1)[query.Skip] == query.Origin.Hash {
- query.Origin.Hash = header.Hash()
+ var (
+ current = origin.Number.Uint64()
+ next = current + query.Skip + 1
+ )
+ if next <= current {
+ infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
+ glog.V(logger.Warn).Infof("%v: GetBlockHeaders skip overflow attack (current %v, skip %v, next %v)\nMalicious peer infos: %s", p, current, query.Skip, next, infos)
+ unknown = true
+ } else {
+ if header := pm.blockchain.GetHeaderByNumber(next); header != nil {
+ if pm.blockchain.GetBlockHashesFromHash(header.Hash(), query.Skip+1)[query.Skip] == query.Origin.Hash {
+ query.Origin.Hash = header.Hash()
+ } else {
+ unknown = true
+ }
} else {
unknown = true
}
- } else {
- unknown = true
}
case query.Reverse:
// Number based traversal towards the genesis block