output: #fixed code
                                  @Override
      public void verify(final UChannel channel,String extension, final ISDKVerifyListener callback) {
  
          try{
  
              JSONObject json = JSONObject.fromObject(extension);
              final String ts = json.getString("ts");
              final String playerId = json.getString("playerId");
              final String accessToken = json.getString("accessToken");
              final String nickname = json.getString("nickName");
  
              SDKVerifyResult vResult = new SDKVerifyResult(true, playerId, "", "");
  
              callback.onSuccess(vResult);
  
              ///2016-10-27 华为这版本流程这里，分为两步，这里不便服务器端做验证，注释下面这些
  //            StringBuilder sb = new StringBuilder();
  //            sb.append(channel.getCpAppID()).append(ts).append(playerId);
  
  //            boolean ok = RSAUtil.verify(sb.toString().getBytes("UTF-8"), LOGIN_RSA_PUBLIC, accessToken);
  //            if(ok){
  //
  //                SDKVerifyResult vResult = new SDKVerifyResult(true, playerId, "", nickname);
  //
  //                callback.onSuccess(vResult);
  //            }else{
  //                callback.onFailed(channel.getMaster().getSdkName() + " verify failed.");
  //            }
  
  
          }catch (Exception e){
              e.printStackTrace();
              callback.onFailed(channel.getMaster().getSdkName() + " verify execute failed. the exception is "+e.getMessage());
          }
  
  
      }
input: #vulnerable code 
                                  @Override
      public void verify(final UChannel channel,String extension, final ISDKVerifyListener callback) {
  
          try{
  
              JSONObject json = JSONObject.fromObject(extension);
              final String ts = json.getString("ts");
              final String playerId = json.getString("playerId");
              final String accessToken = json.getString("accessToken");
              final String nickname = json.getString("nickName");
  
              StringBuilder sb = new StringBuilder();
              sb.append(channel.getCpAppID()).append(ts).append(playerId);
  
              boolean ok = RSAUtil.verify(sb.toString().getBytes("UTF-8"), LOGIN_RSA_PUBLIC, accessToken);
              if(ok){
  
                  SDKVerifyResult vResult = new SDKVerifyResult(true, playerId, "", nickname);
  
                  callback.onSuccess(vResult);
              }else{
                  callback.onFailed(channel.getMaster().getSdkName() + " verify failed.");
              }
  
  
          }catch (Exception e){
              e.printStackTrace();
              callback.onFailed(channel.getMaster().getSdkName() + " verify execute failed. the exception is "+e.getMessage());
          }
  
  
      } 
                              #location 22 
                              #vulnerability type NULL_DEREFERENCE