sync: coreth PR #1215: skip verify block fee if is 0 (#1755)

Co-authored-by: Ceyhun Onur <ceyhun.onur@avalabs.org>

Author: alarso16

plugin/evm/customheader/block_gas_cost.go

@@ -134,6 +134,10 @@ func VerifyBlockFee(
 	if requiredBlockGasCost == nil || !requiredBlockGasCost.IsUint64() {
 		return fmt.Errorf("invalid block gas cost (%d) in apricot phase 4", requiredBlockGasCost)
 	}
+	// If the required block gas cost is 0, we don't need to verify the block fee
+	if requiredBlockGasCost.Sign() == 0 {
+		return nil
+	}
 
 	var (
 		gasUsed              = new(big.Int)

plugin/evm/customheader/block_gas_cost_test.go

@@ -4,11 +4,11 @@
 package customheader
 
 import (
+	"math"
 	"math/big"
 	"testing"
 
 	"github.com/ava-labs/libevm/common"
-	"github.com/ava-labs/libevm/common/math"
 	"github.com/ava-labs/libevm/core/types"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -456,6 +456,14 @@ func TestVerifyBlockFee(t *testing.T) {
 			extraStateContribution: nil,
 			shouldErr:              false,
 		},
+		"zero block gas cost": {
+			baseFee:                big.NewInt(100),
+			parentBlockGasCost:     big.NewInt(0),
+			timeElapsed:            testFeeConfig.TargetBlockRate + 1,
+			txs:                    nil,
+			receipts:               nil,
+			extraStateContribution: nil,
+		},
 	}
 
 	for name, test := range tests {