PVS-Studio warning V557 for ffdshow

static uint crc_tables[8][256];

void InitCRC()
{
  ....
  // Build additional lookup tables.
  for (uint I=0;I<=256;I++)
  {
    uint C=crc_tables[0][I];
    for (uint J=1;J<8;J++)
    {
      C=crc_tables[0][(byte)C]^(C>>8);
      crc_tables[J][I]=C;
    }
  }
}

This suspicious code was found in ffdshow project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The value of 'I' index could reach 256. crc.cpp 39

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/