test for mallformed packages

Author: lathoub

src/AppleMIDI_Defs.h

@@ -31,7 +31,8 @@ enum parserReturn: uint8_t
     Processed,
     NotSureGiveMeMoreData,
     NotEnoughData,
-    UnexpectedData,
+	UnexpectedData,
+	UnexpectedMidiData,
 };
 
 #if defined(__AVR__)

src/rtpMIDI_Parser_MidiCommandSection.hpp

@@ -34,6 +34,11 @@ parserReturn decodeMidiSection(RtpBuffer_t &buffer)
                 return parserReturn::NotEnoughData;
             }
 
+            if (consumed > midiCommandLength) {
+                buffer.clear();
+                return parserReturn::UnexpectedMidiData;
+            }
+
             midiCommandLength -= consumed;
 
             while (consumed--)