fix int conversion (#1)

fix int conversion

Author: Slimak-Text

parser/payload.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"math"
 	"strconv"
 	"sync"
 )
@@ -115,7 +116,7 @@ func (e *PayloadEncoder) EncodeTo(w io.Writer) error {
 	return nil
 }
 
-//IsString returns true if payload encode to string, otherwise returns false.
+// IsString returns true if payload encode to string, otherwise returns false.
 func (e *PayloadEncoder) IsString() bool {
 	return e.isString
 }
@@ -166,5 +167,10 @@ func (d *PayloadDecoder) Next() (*PacketDecoder, error) {
 	if err != nil {
 		return nil, fmt.Errorf("invalid input")
 	}
+
+	if packetLen > math.MaxInt || packetLen < math.MinInt {
+		return nil, fmt.Errorf("invalid input")
+	}
+
 	return NewDecoder(newLimitReader(d.r, int(packetLen)))
 }