stc8: check length of status packet

Fixes a fuzzing error.
2018-08-21 13:15:57 +02:00 · 2018-08-21 13:15:57 +02:00 · ce251f9d30
commit ce251f9d30
parent 11d2ea22e6
1 changed files with 3 additions and 0 deletions
--- a/stcgal/protocols.py
+++ b/stcgal/protocols.py
@ -1569,6 +1569,9 @@ class Stc8Protocol(Stc15Protocol):
    def initialize_status(self, packet):
        """Decode status packet and store basic MCU info"""

+        if len(packet) < 39:
+            raise StcProtocolException("invalid status packet")
+
        self.mcu_clock_hz, = struct.unpack(">I", packet[1:5])
        self.external_clock = False
        # all ones means no calibration