Handle zero-length SYSEX messages

Check that the `storedInputData` buffer is not empty before reading the command ID from the buffer. Fixes: #151
firmata · Nov 26, 2023 · 96c7ed1 · 96c7ed1
1 parent e130f9b
commit 96c7ed1
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/ConfigurableFirmata.cpp b/src/ConfigurableFirmata.cpp
@@ -213,6 +213,10 @@ int FirmataClass::available(void)
  */
 void FirmataClass::processSysexMessage(void)
 {
+  if (sysexBytesRead == 0) {
+    return;
+  }
+
   switch (storedInputData[0]) { //first byte in buffer is command
     case REPORT_FIRMWARE:
       printFirmwareVersion();