int DCTStream::readHuffSym(DCTHuffTable *table) {
  Gushort code;
  int bit;
  int codeBits;

  code = 0;
  codeBits = 0;
  do {
    if ((bit = readBit()) == EOF) {
      return 9999;
    }
    code = (code << 1) + bit;
    ++codeBits;

    if (code < table->firstCode[codeBits]) {
      break;
    }
    if (code - table->firstCode[codeBits] < table->numCodes[codeBits]) {
      code -= table->firstCode[codeBits];
      return table->sym[table->firstSym[codeBits] + code];
    }
  } while (codeBits < 16);

  error(errSyntaxError, getPos(), "Bad Huffman code in DCT stream");
  return 9999;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.