params: reduce extra data to 32 bytes

1 files changed, 8 insertions, 0 deletions

diff --git a/rpc/api/miner.go b/rpc/api/miner.go
index 93507f54a..12203ffe0 100644
--- a/rpc/api/miner.go
+++ b/rpc/api/miner.go
@@ -17,9 +17,12 @@
 package api
 
 import (
+	"fmt"
+
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc/codec"
 	"github.com/ethereum/go-ethereum/rpc/shared"
 )
@@ -122,6 +125,11 @@ func (self *minerApi) SetExtra(req *shared.Request) (interface{}, error) {
 	if err := self.codec.Decode(req.Params, &args); err != nil {
 		return nil, err
 	}
+
+	if uint64(len(args.Data)) > params.MaximumExtraDataSize.Uint64()*2 {
+		return false, fmt.Errorf("extra datasize can be no longer than %v bytes", params.MaximumExtraDataSize)
+	}
+
 	self.ethereum.Miner().SetExtra([]byte(args.Data))
 	return true, nil
 }