cmd/evm: ensure input length is even (ethereum#24721)

* cmd/evm: ensure input length is even

* cmd/evm: minor nit + lintfix

Co-authored-by: Martin Holst Swende <martin@swende.se>

Author: 2 people

cmd/evm/runner.go

@@ -246,7 +246,12 @@ func runCmd(ctx *cli.Context) error {
 	} else {
 		hexInput = []byte(ctx.GlobalString(InputFlag.Name))
 	}
-	input := common.FromHex(string(bytes.TrimSpace(hexInput)))
+	hexInput = bytes.TrimSpace(hexInput)
+	if len(hexInput)%2 != 0 {
+		fmt.Println("input length must be even")
+		os.Exit(1)
+	}
+	input := common.FromHex(string(hexInput))
 
 	var execFunc func() ([]byte, uint64, error)
 	if ctx.GlobalBool(CreateFlag.Name) {