output: #fixed code
                                  public static Memory sysctl(String name) {
          IntByReference size = new IntByReference();
          if (0 != FreeBsdLibc.INSTANCE.sysctlbyname(name, null, size, null, 0)) {
              LOG.error(SYSCTL_FAIL, name, Native.getLastError());
              return null;
          }
          Memory m = new Memory(size.getValue());
          if (0 != FreeBsdLibc.INSTANCE.sysctlbyname(name, m, size, null, 0)) {
              LOG.error(SYSCTL_FAIL, name, Native.getLastError());
              return null;
          }
          return m;
      }
input: #vulnerable code 
                                  public static Memory sysctl(String name) {
          IntByReference size = new IntByReference();
          if (0 != SystemB.INSTANCE.sysctlbyname(name, null, size, null, 0)) {
              LOG.error(SYSCTL_FAIL, name, Native.getLastError());
              return null;
          }
          Memory m = new Memory(size.getValue());
          if (0 != SystemB.INSTANCE.sysctlbyname(name, m, size, null, 0)) {
              LOG.error(SYSCTL_FAIL, name, Native.getLastError());
              return null;
          }
          return m;
      } 
                              #location 8 
                              #vulnerability type INTERFACE_NOT_THREAD_SAFE