output: #fixed code
                                  private Block doPacking(PocMeetingMember self, PocMeetingRound round) throws NulsException, IOException {
  
          Block bestBlock = this.blockService.getBestBlock();
          List<Transaction> allTxList = txCacheManager.getTxList();
          allTxList.sort(TxTimeComparator.getInstance());
          BlockData bd = new BlockData();
          bd.setHeight(bestBlock.getHeader().getHeight() + 1);
          bd.setPreHash(bestBlock.getHeader().getHash());
          BlockRoundData roundData = new BlockRoundData();
          roundData.setRoundIndex(round.getIndex());
          roundData.setConsensusMemberCount(round.getMemberCount());
          roundData.setPackingIndexOfRound(self.getPackingIndexOfRound());
          roundData.setRoundStartTime(round.getStartTime());
  
          bd.setRoundData(roundData);
          List<Integer> outTxList = new ArrayList<>();
          List<Transaction> packingTxList = new ArrayList<>();
          List<NulsDigestData> outHashList = new ArrayList<>();
          long totalSize = 0L;
          for (int i = 0; i < allTxList.size(); i++) {
              if ((self.getPackEndTime() - TimeService.currentTimeMillis()) <= 500L) {
                  break;
              }
              Transaction tx = allTxList.get(i);
              tx.setBlockHeight(bd.getHeight());
              if ((totalSize + tx.size()) >= PocConsensusConstant.MAX_BLOCK_SIZE) {
                  break;
              }
              outHashList.add(tx.getHash());
              ValidateResult result = tx.verify();
              if (result.isFailed()) {
                  Log.error(result.getMessage());
                  outTxList.add(i);
                  BlockLog.info("discard tx:" + tx.getHash());
                  continue;
              }
              try {
                  ledgerService.approvalTx(tx);
              } catch (Exception e) {
                  Log.error(e);
                  outTxList.add(i);
                  BlockLog.info("discard tx:" + tx.getHash());
                  continue;
              }
              packingTxList.add(tx);
              totalSize += tx.size();
              confirmingTxCacheManager.putTx(tx);
  
          }
          txCacheManager.removeTx(outHashList);
          if (totalSize < PocConsensusConstant.MAX_BLOCK_SIZE) {
              addOrphanTx(packingTxList, totalSize, self, bd.getHeight());
          }
          addConsensusTx(bestBlock, packingTxList, self, round);
          bd.setTxList(packingTxList);
          Block newBlock = ConsensusTool.createBlock(bd, round.getLocalPacker());
          ValidateResult result = newBlock.verify();
          if (result.isFailed()) {
              BlockLog.warn("packing block error:" + result.getMessage());
              for (Transaction tx : newBlock.getTxs()) {
                  ledgerService.rollbackTx(tx);
              }
              return null;
          }
          return newBlock;
      }
input: #vulnerable code 
                                  private Block doPacking(PocMeetingMember self, PocMeetingRound round) throws NulsException, IOException {
  
          Block bestBlock = this.blockService.getBestBlock();
          List<Transaction> allTxList = txCacheManager.getTxList();
          allTxList.sort(TxTimeComparator.getInstance());
          BlockData bd = new BlockData();
          bd.setHeight(bestBlock.getHeader().getHeight() + 1);
          bd.setPreHash(bestBlock.getHeader().getHash());
          BlockRoundData roundData = new BlockRoundData();
          roundData.setRoundIndex(round.getIndex());
          roundData.setConsensusMemberCount(round.getMemberCount());
          roundData.setPackingIndexOfRound(self.getPackingIndexOfRound());
          roundData.setRoundStartTime(round.getStartTime());
          StringBuilder str = new StringBuilder();
          str.append(self.getPackingAddress());
          str.append(" ,order:" + self.getPackingIndexOfRound());
          str.append(",packTime:" + new Date(self.getPackEndTime()));
          str.append("\n");
          BlockLog.debug("pack round:" + str);
  
  
          bd.setRoundData(roundData);
          List<Integer> outTxList = new ArrayList<>();
          List<Transaction> packingTxList = new ArrayList<>();
          List<NulsDigestData> outHashList = new ArrayList<>();
          long totalSize = 0L;
          for (int i = 0; i < allTxList.size(); i++) {
              if ((self.getPackEndTime() - TimeService.currentTimeMillis()) <= 500L) {
                  break;
              }
              Transaction tx = allTxList.get(i);
              tx.setBlockHeight(bd.getHeight());
              if ((totalSize + tx.size()) >= PocConsensusConstant.MAX_BLOCK_SIZE) {
                  break;
              }
              outHashList.add(tx.getHash());
              ValidateResult result = tx.verify();
              if (result.isFailed()) {
                  Log.error(result.getMessage());
                  outTxList.add(i);
                  continue;
              }
              try {
                  ledgerService.approvalTx(tx);
              } catch (Exception e) {
                  Log.error(e);
                  outTxList.add(i);
                  continue;
              }
              packingTxList.add(tx);
              totalSize += tx.size();
              confirmingTxCacheManager.putTx(tx);
  
          }
          txCacheManager.removeTx(outHashList);
          if (totalSize < PocConsensusConstant.MAX_BLOCK_SIZE) {
              addOrphanTx(packingTxList, totalSize, self,bd.getHeight());
          }
          addConsensusTx(bestBlock, packingTxList, self, round);
          bd.setTxList(packingTxList);
          Log.info("txCount:" + packingTxList.size());
          Block newBlock = ConsensusTool.createBlock(bd, round.getLocalPacker());
          System.out.printf("========height:" + newBlock.getHeader().getHeight() + ",time:" + DateUtil.convertDate(new Date(newBlock.getHeader().getTime())) + ",packEndTime:" +
                  DateUtil.convertDate(new Date(self.getPackEndTime())));
          ValidateResult result = newBlock.verify();
          if (result.isFailed()) {
              Log.warn("packing block error:" + result.getMessage());
              for (Transaction tx : newBlock.getTxs()) {
                  ledgerService.rollbackTx(tx);
              }
              return null;
          }
          return newBlock;
      } 
                              #location 63 
                              #vulnerability type CHECKERS_PRINTF_ARGS