GBool FlateStream::readDynamicCodes() {
  int numCodeLenCodes;
  int numLitCodes;
  int numDistCodes;
  int codeLenCodeLengths[flateMaxCodeLenCodes];
  FlateHuffmanTab codeLenCodeTab;
  int len, repeat, code;
  int i;

  codeLenCodeTab.codes = NULL;

  if ((numLitCodes = getCodeWord(5)) == EOF) {
    goto err;
  }
  numLitCodes += 257;
  if ((numDistCodes = getCodeWord(5)) == EOF) {
    goto err;
  }
  numDistCodes += 1;
  if ((numCodeLenCodes = getCodeWord(4)) == EOF) {
    goto err;
  }
  numCodeLenCodes += 4;
  if (numLitCodes > flateMaxLitCodes ||
      numDistCodes > flateMaxDistCodes ||
      numCodeLenCodes > flateMaxCodeLenCodes) {
    goto err;
  }

  for (i = 0; i < flateMaxCodeLenCodes; ++i) {
    codeLenCodeLengths[i] = 0;
  }
  for (i = 0; i < numCodeLenCodes; ++i) {
    if ((codeLenCodeLengths[codeLenCodeMap[i]] = getCodeWord(3)) == -1) {
      goto err;
    }
  }
  compHuffmanCodes(codeLenCodeLengths, flateMaxCodeLenCodes, &codeLenCodeTab);

  len = 0;
  repeat = 0;
  i = 0;
  while (i < numLitCodes + numDistCodes) {
    if ((code = getHuffmanCodeWord(&codeLenCodeTab)) == EOF) {
      goto err;
    }
    if (code == 16) {
      if ((repeat = getCodeWord(2)) == EOF) {
	goto err;
      }
      repeat += 3;
      if (i + repeat > numLitCodes + numDistCodes) {
	goto err;
      }
      for (; repeat > 0; --repeat) {
	codeLengths[i++] = len;
      }
    } else if (code == 17) {
      if ((repeat = getCodeWord(3)) == EOF) {
	goto err;
      }
      repeat += 3;
      if (i + repeat > numLitCodes + numDistCodes) {
	goto err;
      }
      len = 0;
      for (; repeat > 0; --repeat) {
	codeLengths[i++] = 0;
      }
    } else if (code == 18) {
      if ((repeat = getCodeWord(7)) == EOF) {
	goto err;
      }
      repeat += 11;
      if (i + repeat > numLitCodes + numDistCodes) {
	goto err;
      }
      len = 0;
      for (; repeat > 0; --repeat) {
	codeLengths[i++] = 0;
      }
    } else {
      codeLengths[i++] = len = code;
    }
  }
  compHuffmanCodes(codeLengths, numLitCodes, &litCodeTab);
  compHuffmanCodes(codeLengths + numLitCodes, numDistCodes, &distCodeTab);

  gfree(codeLenCodeTab.codes);
  return gTrue;

err:
  error(errSyntaxError, getPos(), "Bad dynamic code table in flate stream");
  gfree(codeLenCodeTab.codes);
  return gFalse;
}

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.