static int formatIPTC(Image *ifile, Image *ofile)
{
  char
    temp[MagickPathExtent];

  unsigned int
    foundiptc,
    tagsfound;

  unsigned char
    recnum,
    dataset;

  unsigned char
    *readable,
    *str;

  ssize_t
    tagindx,
    taglen;

  int
    i,
    tagcount = (int) (sizeof(tags) / sizeof(tag_spec));

  int
    c;

  foundiptc = 0; /* found the IPTC-Header */
  tagsfound = 0; /* number of tags found */

  c = ReadBlobByte(ifile);
  while (c != EOF)
  {
    if (c == 0x1c)
      foundiptc = 1;
    else
      {
        if (foundiptc)
          return(-1);
        else
          {
            c=0;
            continue;
          }
      }

    /* we found the 0x1c tag and now grab the dataset and record number tags */
    c = ReadBlobByte(ifile);
    if (c == EOF)
      return(-1);
    dataset = (unsigned char) c;
    c = ReadBlobByte(ifile);
    if (c == EOF)
      return(-1);
    recnum = (unsigned char) c;
    /* try to match this record to one of the ones in our named table */
    for (i=0; i< tagcount; i++)
    {
      if (tags[i].id == (short) recnum)
          break;
    }
    if (i < tagcount)
      readable = (unsigned char *) tags[i].name;
    else
      readable = (unsigned char *) "";
    /*
      We decode the length of the block that follows - ssize_t or short fmt.
    */
    c=ReadBlobByte(ifile);
    if (c == EOF)
      return(-1);
    if (c & (unsigned char) 0x80)
      return(0);
    else
      {
        int
          c0;

        c0=ReadBlobByte(ifile);
        if (c0 == EOF)
          return(-1);
        taglen = (c << 8) | c0;
      }
    if (taglen < 0)
      return(-1);
    /* make a buffer to hold the tag datand snag it from the input stream */
    str=(unsigned char *) AcquireQuantumMemory((size_t) (taglen+MagickPathExtent),
      sizeof(*str));
    if (str == (unsigned char *) NULL)
      return(0);
    for (tagindx=0; tagindx<taglen; tagindx++)
    {
      c=ReadBlobByte(ifile);
      if (c == EOF)
        {
          str=(unsigned char *) RelinquishMagickMemory(str);
          return(-1);
        }
      str[tagindx] = (unsigned char) c;
    }
    str[taglen] = 0;

    /* now finish up by formatting this binary data into ASCII equivalent */
    if (strlen((char *)readable) > 0)
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d#%s=",
        (unsigned int) dataset, (unsigned int) recnum, readable);
    else
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d=",
        (unsigned int) dataset,(unsigned int) recnum);
    (void) WriteBlobString(ofile,temp);
    formatString( ofile, (char *)str, taglen );
    str=(unsigned char *) RelinquishMagickMemory(str);

    tagsfound++;

    c=ReadBlobByte(ifile);
  }
  return((int) tagsfound);
}

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.