hsfz: incorrect_tester_address packets have addressing.

Author: antoniovazquezblanco

scapy/contrib/automotive/bmw/hsfz.py

@@ -70,11 +70,12 @@ class HSFZ(Packet):
 
     def _hasaddrs(self):
         # type: () -> bool
-        # Address present in diagnostic_req_res, acknowledge_transfer and
-        # two byte length alive_check frames.
+        # Address present in diagnostic_req_res, acknowledge_transfer,
+        # two byte length alive_check and incorrect_tester_address frames.
         return self.control == 0x01 or \
             self.control == 0x02 or \
-            (self.control == 0x12 and self.length == 2)
+            (self.control == 0x12 and self.length == 2) or \
+            self.control == 0x40
 
     def _hasidstring(self):
         # type: () -> bool

test/contrib/automotive/bmw/hsfz.uts

@@ -124,6 +124,14 @@ assert pkt.source == 0x00
 assert pkt.target == 0xf4
 
 
+= Dissect incorrect tester address
+pkt = HSFZ(bytes.fromhex("000000020040fff4"))
+assert pkt.length == 2
+assert pkt.control == 0x40
+assert pkt.source == 0xff
+assert pkt.target == 0xf4
+
+
 = Test HSFZSocket
 
 server_up = threading.Event()