Fix Instruction error

src/Neo.VM/Instruction.cs

@@ -205,14 +205,21 @@ internal Instruction(ReadOnlyMemory<byte> script, int ip) : this((OpCode)script.
  operandSize = OperandSizeTable[(int)OpCode];
  break;
  case 1:
+ if (ip >= span.Length)
+ throw new BadScriptException($"Instrucion out of bounds. InstructionPointer: {ip}");
  operandSize = span[ip];
  break;
  case 2:
+ if (ip + 1 >= span.Length)
+ throw new BadScriptException($"Instrucion out of bounds. InstructionPointer: {ip}");
  operandSize = BinaryPrimitives.ReadUInt16LittleEndian(span[ip..]);
  break;
  case 4:
+ if (ip + 3 >= span.Length)
+ throw new BadScriptException($"Instrucion out of bounds. InstructionPointer: {ip}");
  operandSize = BinaryPrimitives.ReadInt32LittleEndian(span[ip..]);
- if (operandSize < 0) throw new BadScriptException();
+ if (operandSize < 0)
+ throw new BadScriptException($"Instrucion out of bounds. InstructionPointer: {ip}, operandSize: {operandSize}");
  break;
  }
  ip += operandSizePrefix;

tests/Neo.VM.Tests/UtScript.cs

@@ -35,6 +35,15 @@ public void StrictMode()
 
  var script = new Script(rawScript, false);
  Assert.AreEqual(2, script.Length);
+
+ rawScript = new byte[] { (byte)OpCode.PUSHDATA1 };
+ Assert.ThrowsException<BadScriptException>(() => new Script(rawScript, true));
+
+ rawScript = new byte[] { (byte)OpCode.PUSHDATA2 };
+ Assert.ThrowsException<BadScriptException>(() => new Script(rawScript, true));
+
+ rawScript = new byte[] { (byte)OpCode.PUSHDATA4 };
+ Assert.ThrowsException<BadScriptException>(() => new Script(rawScript, true));
  }
 
  [TestMethod]