Program: 8331
Project: 8331
Buggy source:
public PgpEditKeyResult modifySecretKeyRing(CanonicalizedSecretKeyRing wsKR,CryptoInputParcel cryptoInput,SaveKeyringParcel saveParcel,OperationLog log){
  int indent=0;
  log.add(LogType.MSG_MF,indent,KeyFormattingUtils.convertKeyIdToHex(wsKR.getMasterKeyId()));
  indent+=1;
  progress(R.string.progress_building_key,0);
  if (saveParcel.mMasterKeyId == null || saveParcel.mMasterKeyId != wsKR.getMasterKeyId()) {
    log.add(LogType.MSG_MF_ERROR_KEYID,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  PGPSecretKeyRing sKR=wsKR.getRing();
  PGPSecretKey masterSecretKey=sKR.getSecretKey();
  if (saveParcel.mFingerprint == null || !Arrays.equals(saveParcel.mFingerprint,masterSecretKey.getPublicKey().getFingerprint())) {
    log.add(LogType.MSG_MF_ERROR_FINGERPRINT,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  if (saveParcel.isEmpty()) {
    log.add(LogType.MSG_MF_ERROR_NOOP,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  for (  SaveKeyringParcel.SubkeyChange change : saveParcel.mChangeSubKeys) {
    if (change.mMoveKeyToCard) {
      byte[] subKeyId=new byte[8];
      ByteBuffer buf=ByteBuffer.wrap(subKeyId);
      buf.putLong(change.mKeyId).rewind();
      byte[] serialNumber=cryptoInput.getCryptoData().get(buf);
      if (serialNumber != null) {
        change.mMoveKeyToCard=false;
        change.mDummyDivert=serialNumber;
      }
    }
  }
  if (isDummy(masterSecretKey) || saveParcel.isRestrictedOnly()) {
    log.add(LogType.MSG_MF_RESTRICTED_MODE,indent);
    return internalRestricted(sKR,saveParcel,log);
  }
  if (!isDivertToCard(masterSecretKey) && !cryptoInput.hasPassphrase()) {
    log.add(LogType.MSG_MF_REQUIRE_PASSPHRASE,indent);
    return new PgpEditKeyResult(log,RequiredInputParcel.createRequiredSignPassphrase(masterSecretKey.getKeyID(),masterSecretKey.getKeyID(),cryptoInput.getSignatureTime()));
  }
  PGPPublicKey masterPublicKey=masterSecretKey.getPublicKey();
  int masterKeyFlags=readKeyFlags(masterPublicKey) | KeyFlags.CERTIFY_OTHER;
  Date expiryTime=wsKR.getPublicKey().getExpiryTime();
  long masterKeyExpiry=expiryTime != null ? expiryTime.getTime() / 1000 : 0L;
  return internal(sKR,masterSecretKey,masterKeyFlags,masterKeyExpiry,cryptoInput,saveParcel,log);
}

Fixed version (ground truth):
public PgpEditKeyResult modifySecretKeyRing(CanonicalizedSecretKeyRing wsKR,CryptoInputParcel cryptoInput,SaveKeyringParcel saveParcel,OperationLog log,int indent){
  log.add(LogType.MSG_MF,indent,KeyFormattingUtils.convertKeyIdToHex(wsKR.getMasterKeyId()));
  indent+=1;
  progress(R.string.progress_building_key,0);
  if (saveParcel.mMasterKeyId == null || saveParcel.mMasterKeyId != wsKR.getMasterKeyId()) {
    log.add(LogType.MSG_MF_ERROR_KEYID,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  PGPSecretKeyRing sKR=wsKR.getRing();
  PGPSecretKey masterSecretKey=sKR.getSecretKey();
  if (saveParcel.mFingerprint == null || !Arrays.equals(saveParcel.mFingerprint,masterSecretKey.getPublicKey().getFingerprint())) {
    log.add(LogType.MSG_MF_ERROR_FINGERPRINT,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  if (saveParcel.isEmpty()) {
    log.add(LogType.MSG_MF_ERROR_NOOP,indent);
    return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR,log,null);
  }
  for (  SaveKeyringParcel.SubkeyChange change : saveParcel.mChangeSubKeys) {
    if (change.mMoveKeyToCard) {
      byte[] subKeyId=new byte[8];
      ByteBuffer buf=ByteBuffer.wrap(subKeyId);
      buf.putLong(change.mKeyId).rewind();
      byte[] serialNumber=cryptoInput.getCryptoData().get(buf);
      if (serialNumber != null) {
        change.mMoveKeyToCard=false;
        change.mDummyDivert=serialNumber;
      }
    }
  }
  if (isDummy(masterSecretKey) || saveParcel.isRestrictedOnly()) {
    log.add(LogType.MSG_MF_RESTRICTED_MODE,indent);
    return internalRestricted(sKR,saveParcel,log,indent + 1);
  }
  if (!isDivertToCard(masterSecretKey) && !cryptoInput.hasPassphrase()) {
    log.add(LogType.MSG_MF_REQUIRE_PASSPHRASE,indent);
    return new PgpEditKeyResult(log,RequiredInputParcel.createRequiredSignPassphrase(masterSecretKey.getKeyID(),masterSecretKey.getKeyID(),cryptoInput.getSignatureTime()));
  }
  PGPPublicKey masterPublicKey=masterSecretKey.getPublicKey();
  int masterKeyFlags=readKeyFlags(masterPublicKey) | KeyFlags.CERTIFY_OTHER;
  Date expiryTime=wsKR.getPublicKey().getExpiryTime();
  long masterKeyExpiry=expiryTime != null ? expiryTime.getTime() / 1000 : 0L;
  return internal(sKR,masterSecretKey,masterKeyFlags,masterKeyExpiry,cryptoInput,saveParcel,log,indent);
}