PVS-Studio warning V512 for ACE

struct Message
{
  unsigned int sn;
  unsigned short payload[payload_size];
};

int
ACE_TMAIN (int argc, ACE_TCHAR* argv[])
{
  ...
  if (ACE_OS::memcmp (expected_msg.payload,
                      msg.payload,
                      payload_size) != 0)
  {
    damaged[msg.sn] = 1;
  }
  ...
}

Most likely this is what should be written here: payload_size * sizeof(short)


This suspicious code was found in ACE project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memcmp' function will lead to underflow of the buffer 'expected_msg.payload'. Send_Msg_Receiver receiver.cpp 109

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/