Problem: Int64 is not checked in gas related api

CHANGELOG.md

@@ -79,6 +79,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 - (evm) [#405](https://github.com/crypto-org-chain/ethermint/pull/405) Avoid duplicate cache events emitted from evm hooks.
 - (rpc) [#406](https://github.com/crypto-org-chain/ethermint/pull/406) Align filter rule for eth_getLogs when toBlock is newer than latest or extract error occurs.
 - (rpc) [#409](https://github.com/crypto-org-chain/ethermint/pull/409) Fix nextBaseFee in eth_feeHistory before fee market param change.
+- (rpc) [#425](https://github.com/crypto-org-chain/ethermint/pull/425) Avoid Int64() out of bound error in gas related api.
 
 ### Improvements
 

rpc/backend/chain_info.go

@@ -303,7 +303,7 @@ func (b *Backend) FeeHistory(
 // Although we don't support tx prioritization yet, but we return a positive value to help client to
 // mitigate the base fee changes.
 func (b *Backend) SuggestGasTipCap(baseFee *big.Int) (*big.Int, error) {
-	if baseFee == nil {
+	if baseFee == nil || !baseFee.IsInt64() {
 		// london hardfork not enabled or feemarket not enabled
 		return big.NewInt(0), nil
 	}

rpc/backend/node_info.go

@@ -345,10 +345,10 @@
 	}
 
 	minGasPrice := b.cfg.GetMinGasPrices()
-	amt := minGasPrice.AmountOf(evmParams.Params.EvmDenom).TruncateInt64()
-	if amt == 0 {
+	amt := minGasPrice.AmountOf(evmParams.Params.EvmDenom).TruncateInt()
+	if !amt.IsInt64() || amt.IsZero() {
 		return ethermint.DefaultGasPrice
 	}
 
-	return amt
+	return amt.Int64()
 }

rpc/backend/node_info_test.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math/big"
 
+	"cosmossdk.io/math"
 	tmrpcclient "github.com/cometbft/cometbft/rpc/client"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
@@ -41,6 +42,17 @@ func (suite *BackendTestSuite) TestRPCMinGasPrice() {
 			ethermint.DefaultGasPrice,
 			true,
 		},
+		{
+			"pass - min gas price exceeds math.MaxUint64",
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.EVMQueryClient)
+				RegisterParamsWithoutHeader(queryClient, 1)
+				amt, _ := math.NewIntFromString("18446744073709551616")
+				suite.backend.cfg.SetMinGasPrices([]sdk.DecCoin{sdk.NewDecCoin(ethermint.AttoPhoton, amt)})
+			},
+			ethermint.DefaultGasPrice,
+			true,
+		},
 	}
 
 	for _, tc := range testCases {