Program: 91001
Project: 91001
Buggy source:
@Override public Transaction getSignedTransaction(UnsignedTransaction unsigned,Bip44AccountExternalSignature forAccount){
  if (!initialize()) {
    return null;
  }
  setState(Status.readyToScan,currentAccountState);
  SignTx signTx=SignTx.newBuilder().setCoinName(getNetwork().getCoinName()).setInputsCount(unsigned.getFundingOutputs().length).setOutputsCount(unsigned.getOutputs().length).build();
  Message response;
  try {
    response=getSignatureDevice().send(signTx);
  }
 catch (  ExtSigDeviceConnectionException ex) {
    postErrorMessage(ex.getMessage());
    return null;
  }
  SigningRequest[] signatureInfo=unsigned.getSignatureInfo();
  ByteWriter signedTx=new ByteWriter(1024);
  while (true) {
    try {
      response=filterMessages(response);
    }
 catch (    ExtSigDeviceConnectionException ex) {
      postErrorMessage(ex.getMessage());
      return null;
    }
    if (response == null) {
      return null;
    }
    if (!(response instanceof TxRequest)) {
      Log.e("String_Node_Str","String_Node_Str" + response.getClass().toString());
      return null;
    }
    TxRequest txRequest=(TxRequest)response;
    if (txRequest.hasSerialized() && txRequest.getSerialized().hasSerializedTx()) {
      signedTx.putBytes(txRequest.getSerialized().getSerializedTx().toByteArray());
    }
    if (txRequest.getRequestType() == TrezorType.RequestType.TXFINISHED) {
      break;
    }
    TrezorType.TxRequestDetailsType txRequestDetailsType=txRequest.getDetails();
    Log.d("String_Node_Str","String_Node_Str" + txRequest.getRequestType().toString());
    Transaction currentTx;
    if (txRequestDetailsType.hasTxHash()) {
      Sha256Hash requestHash=Sha256Hash.of(txRequestDetailsType.getTxHash().toByteArray());
      currentTx=TransactionEx.toTransaction(forAccount.getTransaction(requestHash));
    }
 else {
      currentTx=Transaction.fromUnsignedTransaction(unsigned);
    }
    if (txRequest.getRequestType() == TrezorType.RequestType.TXMETA) {
      TrezorType.TransactionType txType=TrezorType.TransactionType.newBuilder().setInputsCnt(currentTx.inputs.length).setOutputsCnt(currentTx.outputs.length).setVersion(currentTx.version).setLockTime(currentTx.lockTime).build();
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
 else     if (txRequest.getRequestType() == TrezorType.RequestType.TXINPUT) {
      TransactionInput ak_input=currentTx.inputs[txRequestDetailsType.getRequestIndex()];
      ByteString prevHash=ByteString.copyFrom(ak_input.outPoint.hash.getBytes());
      ByteString scriptSig=ByteString.copyFrom(ak_input.script.getScriptBytes());
      TrezorType.TxInputType.Builder txInputBuilder=TrezorType.TxInputType.newBuilder().setPrevHash(prevHash).setPrevIndex(ak_input.outPoint.index).setSequence(ak_input.sequence).setScriptSig(scriptSig);
      if (!txRequestDetailsType.hasTxHash()) {
        SigningRequest signingRequest=signatureInfo[txRequestDetailsType.getRequestIndex()];
        Address toSignWith=signingRequest.publicKey.toAddress(getNetwork());
        if (toSignWith != null) {
          Optional<Integer[]> addId=forAccount.getAddressId(toSignWith);
          if (addId.isPresent()) {
            new InputAddressSetter(txInputBuilder).setAddressN(forAccount.getAccountIndex(),addId.get());
          }
        }
 else {
          Log.w("String_Node_Str","String_Node_Str" + txRequestDetailsType.getRequestIndex());
        }
      }
      TrezorType.TxInputType txInput=txInputBuilder.build();
      TrezorType.TransactionType txType=TrezorType.TransactionType.newBuilder().addInputs(txInput).build();
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
 else     if (txRequest.getRequestType() == TrezorType.RequestType.TXOUTPUT) {
      TransactionOutput ak_output=currentTx.outputs[txRequestDetailsType.getRequestIndex()];
      TrezorType.TransactionType txType;
      if (txRequestDetailsType.hasTxHash()) {
        ByteString scriptPubKey=ByteString.copyFrom(ak_output.script.getScriptBytes());
        TrezorType.TxOutputBinType txOutput=TrezorType.TxOutputBinType.newBuilder().setScriptPubkey(scriptPubKey).setAmount(ak_output.value).build();
        txType=TrezorType.TransactionType.newBuilder().addBinOutputs(txOutput).build();
      }
 else {
        Address address=ak_output.script.getAddress(getNetwork());
        TrezorType.TxOutputType.Builder txOutput=TrezorType.TxOutputType.newBuilder().setAmount(ak_output.value).setScriptType(mapScriptType(ak_output.script));
        Optional<Integer[]> addId=forAccount.getAddressId(address);
        if (addId.isPresent() && addId.get()[0] == 1) {
          new OutputAddressSetter(txOutput).setAddressN(forAccount.getAccountIndex(),addId.get());
        }
 else {
          txOutput.setAddress(address.toString());
        }
        txType=TrezorType.TransactionType.newBuilder().addOutputs(txOutput.build()).build();
      }
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
  }
  Transaction ret;
  try {
    ret=Transaction.fromByteReader(new ByteReader(signedTx.toBytes()));
    checkSignedTransaction(unsigned,signedTx);
  }
 catch (  Transaction.TransactionParsingException e) {
    postErrorMessage("String_Node_Str");
    Log.e("String_Node_Str","String_Node_Str" + e.getMessage(),e);
    return null;
  }
catch (  ScriptException e) {
    postErrorMessage("String_Node_Str");
    Log.e(TAG,"String_Node_Str",e);
    return null;
  }
  return ret;
}

Fixed version (ground truth):
@Override public Transaction getSignedTransaction(UnsignedTransaction unsigned,Bip44AccountExternalSignature forAccount){
  if (!initialize()) {
    return null;
  }
  setState(Status.readyToScan,currentAccountState);
  SignTx signTx=SignTx.newBuilder().setCoinName(getNetwork().getCoinName()).setInputsCount(unsigned.getFundingOutputs().length).setOutputsCount(unsigned.getOutputs().length).build();
  Message response;
  try {
    response=getSignatureDevice().send(signTx);
  }
 catch (  ExtSigDeviceConnectionException ex) {
    postErrorMessage(ex.getMessage());
    return null;
  }
  SigningRequest[] signatureInfo=unsigned.getSignatureInfo();
  ByteWriter signedTx=new ByteWriter(1024);
  while (true) {
    try {
      response=filterMessages(response);
    }
 catch (    ExtSigDeviceConnectionException ex) {
      postErrorMessage(ex.getMessage());
      return null;
    }
    if (response == null) {
      return null;
    }
    if (!(response instanceof TxRequest)) {
      Log.e("String_Node_Str","String_Node_Str" + response.getClass().toString());
      return null;
    }
    TxRequest txRequest=(TxRequest)response;
    if (txRequest.hasSerialized() && txRequest.getSerialized().hasSerializedTx()) {
      signedTx.putBytes(txRequest.getSerialized().getSerializedTx().toByteArray());
    }
    if (txRequest.getRequestType() == TrezorType.RequestType.TXFINISHED) {
      break;
    }
    TrezorType.TxRequestDetailsType txRequestDetailsType=txRequest.getDetails();
    Log.d("String_Node_Str","String_Node_Str" + txRequest.getRequestType().toString());
    Transaction currentTx;
    if (txRequestDetailsType.hasTxHash()) {
      Sha256Hash requestHash=Sha256Hash.of(txRequestDetailsType.getTxHash().toByteArray());
      currentTx=TransactionEx.toTransaction(forAccount.getTransaction(requestHash));
    }
 else {
      currentTx=Transaction.fromUnsignedTransaction(unsigned);
    }
    if (txRequest.getRequestType() == TrezorType.RequestType.TXMETA) {
      TrezorType.TransactionType txType=TrezorType.TransactionType.newBuilder().setInputsCnt(currentTx.inputs.length).setOutputsCnt(currentTx.outputs.length).setVersion(currentTx.version).setLockTime(currentTx.lockTime).build();
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
 else     if (txRequest.getRequestType() == TrezorType.RequestType.TXINPUT) {
      TransactionInput ak_input=currentTx.inputs[txRequestDetailsType.getRequestIndex()];
      ByteString prevHash=ByteString.copyFrom(ak_input.outPoint.txid.getBytes());
      ByteString scriptSig=ByteString.copyFrom(ak_input.script.getScriptBytes());
      TrezorType.TxInputType.Builder txInputBuilder=TrezorType.TxInputType.newBuilder().setPrevHash(prevHash).setPrevIndex(ak_input.outPoint.index).setSequence(ak_input.sequence).setScriptSig(scriptSig);
      if (!txRequestDetailsType.hasTxHash()) {
        SigningRequest signingRequest=signatureInfo[txRequestDetailsType.getRequestIndex()];
        Address toSignWith=signingRequest.publicKey.toAddress(getNetwork());
        if (toSignWith != null) {
          Optional<Integer[]> addId=forAccount.getAddressId(toSignWith);
          if (addId.isPresent()) {
            new InputAddressSetter(txInputBuilder).setAddressN(forAccount.getAccountIndex(),addId.get());
          }
        }
 else {
          Log.w("String_Node_Str","String_Node_Str" + txRequestDetailsType.getRequestIndex());
        }
      }
      TrezorType.TxInputType txInput=txInputBuilder.build();
      TrezorType.TransactionType txType=TrezorType.TransactionType.newBuilder().addInputs(txInput).build();
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
 else     if (txRequest.getRequestType() == TrezorType.RequestType.TXOUTPUT) {
      TransactionOutput ak_output=currentTx.outputs[txRequestDetailsType.getRequestIndex()];
      TrezorType.TransactionType txType;
      if (txRequestDetailsType.hasTxHash()) {
        ByteString scriptPubKey=ByteString.copyFrom(ak_output.script.getScriptBytes());
        TrezorType.TxOutputBinType txOutput=TrezorType.TxOutputBinType.newBuilder().setScriptPubkey(scriptPubKey).setAmount(ak_output.value).build();
        txType=TrezorType.TransactionType.newBuilder().addBinOutputs(txOutput).build();
      }
 else {
        Address address=ak_output.script.getAddress(getNetwork());
        TrezorType.TxOutputType.Builder txOutput=TrezorType.TxOutputType.newBuilder().setAmount(ak_output.value).setScriptType(mapScriptType(ak_output.script));
        Optional<Integer[]> addId=forAccount.getAddressId(address);
        if (addId.isPresent() && addId.get()[0] == 1) {
          new OutputAddressSetter(txOutput).setAddressN(forAccount.getAccountIndex(),addId.get());
        }
 else {
          txOutput.setAddress(address.toString());
        }
        txType=TrezorType.TransactionType.newBuilder().addOutputs(txOutput.build()).build();
      }
      TrezorMessage.TxAck txAck=TrezorMessage.TxAck.newBuilder().setTx(txType).build();
      response=getSignatureDevice().send(txAck);
    }
  }
  Transaction ret;
  try {
    ret=Transaction.fromByteReader(new ByteReader(signedTx.toBytes()));
    checkSignedTransaction(unsigned,signedTx);
  }
 catch (  Transaction.TransactionParsingException e) {
    postErrorMessage("String_Node_Str");
    Log.e("String_Node_Str","String_Node_Str" + e.getMessage(),e);
    return null;
  }
catch (  ScriptException e) {
    postErrorMessage("String_Node_Str");
    Log.e(TAG,"String_Node_Str",e);
    return null;
  }
  return ret;
}