cmd/evm: handle rlp errors in t9n (ethereum#23771)

* cmd/evm: handle rlp errors in t9n

* cmd/evm/testdata: fix readme

Author: holiman

cmd/evm/internal/t8ntool/transaction.go

@@ -121,6 +121,9 @@ func Transaction(ctx *cli.Context) error {
 	}
 	var results []result
 	for it.Next() {
+		if err := it.Err(); err != nil {
+			return NewError(ErrorIO, err)
+		}
 		var tx types.Transaction
 		err := rlp.DecodeBytes(it.Value(), &tx)
 		if err != nil {

cmd/evm/t8n_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"github.com/docker/docker/pkg/reexec"
+	"github.com/ethereum/go-ethereum/cmd/evm/internal/t8ntool"
 	"github.com/ethereum/go-ethereum/internal/cmdtest"
 )
 
@@ -265,6 +266,14 @@ func TestT9n(t *testing.T) {
 			},
 			expOut: "exp.json",
 		},
+		{ // Invalid RLP
+			base: "./testdata/18",
+			input: t9nInput{
+				inTxs:  "invalid.rlp",
+				stFork: "London",
+			},
+			expExitCode: t8ntool.ErrorIO,
+		},
 	} {
 
 		args := []string{"t9n"}

cmd/evm/testdata/18/README.md

@@ -0,0 +1,9 @@
+# Invalid rlp
+
+This folder contains a sample of invalid RLP, and it's expected
+that the t9n handles this properly: 
+
+```
+$ go run . t9n --input.txs=./testdata/18/invalid.rlp --state.fork=London 
+ERROR(11): rlp: value size exceeds available input length
+```

cmd/evm/testdata/18/invalid.rlp

@@ -0,0 +1 @@
+"0xf852328001825208870b9331677e6ebf0a801ca098ff921201554726367d2be8c804a7ff89ccf285ebc57dff8ae4c44b9c19ac4aa03887321be575c8095f789dd4c743dfe42c1820f9231f98a962b210e3ac2452a3"