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Add payload length validation in USB frame decoder

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just_stuff_tm
2026-03-02 02:46:50 -05:00
committed by just-stuff-tm
parent 2d1160d992
commit 9a0572e8e4
1 changed files with 6 additions and 0 deletions
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lib/services/usb_serial_frame_codec.dart
+6
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@@ -3,6 +3,7 @@ import 'dart:typed_data';
const int usbSerialTxFrameStart = 0x3c; const int usbSerialTxFrameStart = 0x3c;
const int usbSerialRxFrameStart = 0x3e; const int usbSerialRxFrameStart = 0x3e;
const int usbSerialHeaderLength = 3; const int usbSerialHeaderLength = 3;
const int usbSerialMaxPayloadLength = 172;
Uint8List wrapUsbSerialTxFrame(Uint8List payload) { Uint8List wrapUsbSerialTxFrame(Uint8List payload) {
final packet = Uint8List(usbSerialHeaderLength + payload.length); final packet = Uint8List(usbSerialHeaderLength + payload.length);
@@ -59,6 +60,11 @@ class UsbSerialFrameDecoder {
final payloadLength = final payloadLength =
_rxBuffer[_startIndex + 1] | (_rxBuffer[_startIndex + 2] << 8); _rxBuffer[_startIndex + 1] | (_rxBuffer[_startIndex + 2] << 8);
if (payloadLength > usbSerialMaxPayloadLength) {
_startIndex++;
_compactBufferIfNeeded();
continue;
}
final packetLength = usbSerialHeaderLength + payloadLength; final packetLength = usbSerialHeaderLength + payloadLength;
if (availableLength < packetLength) { if (availableLength < packetLength) {
_compactBufferIfNeeded(force: true); _compactBufferIfNeeded(force: true);