Add a validation for Advertising Data. Lengh should not be less than 1.

Author: Yasuki Okumura

adv.go

@@ -93,9 +93,12 @@ func (a *Advertisement) unmarshall(b []byte) error {
 			return errors.New("invalid advertise data")
 		}
 		l, t := b[0], b[1]
-		if len(b) < int(1+l) {
+		if int(l) < 1 || len(b) < int(1+l) {
 			return errors.New("invalid advertise data")
 		}
+
+		log.Printf("len(b)[ %d ], int(1+l)[%d]", len(b), int(1+l))
+
 		d := b[2 : 1+l]
 		switch t {
 		case typeFlags:
@@ -131,7 +134,7 @@ func (a *Advertisement) unmarshall(b []byte) error {
 		// case typeServiceData32,
 		// case typeServiceData128:
 		default:
-			log.Printf("DATA: [ % X ]", d)
+			log.Printf("DATAAAAAA: [ % X ]", d)
 		}
 		b = b[1+l:]
 	}