static int format8BIM(Image *ifile, Image *ofile)
{
  char
    temp[MagickPathExtent];

  unsigned int
    foundOSType;

  int
    ID,
    resCount,
    i,
    c;

  ssize_t
    count;

  unsigned char
    *PString,
    *str;

  resCount=0;
  foundOSType=0; /* found the OSType */
  (void) foundOSType;
  c=ReadBlobByte(ifile);
  while (c != EOF)
  {
    if (c == '8')
      {
        unsigned char
          buffer[5];

        buffer[0]=(unsigned char) c;
        for (i=1; i<4; i++)
        {
          c=ReadBlobByte(ifile);
          if (c == EOF)
            return(-1);
          buffer[i] = (unsigned char) c;
        }
        buffer[4]=0;
        if (strcmp((const char *)buffer, "8BIM") == 0)
          foundOSType=1;
        else
          continue;
      }
    else
      {
        c=ReadBlobByte(ifile);
        continue;
      }
    /*
      We found the OSType (8BIM) and now grab the ID, PString, and Size fields.
    */
    ID=ReadBlobMSBSignedShort(ifile);
    if (ID < 0)
      return(-1);
    {
      unsigned char
        plen;

      c=ReadBlobByte(ifile);
      if (c == EOF)
        return(-1);
      plen = (unsigned char) c;
      PString=(unsigned char *) AcquireQuantumMemory((size_t) (plen+
        MagickPathExtent),sizeof(*PString));
      if (PString == (unsigned char *) NULL)
        return 0;
      for (i=0; i<plen; i++)
      {
        c=ReadBlobByte(ifile);
        if (c == EOF)
          {
            PString=(unsigned char *) RelinquishMagickMemory(PString);
            return -1;
          }
        PString[i] = (unsigned char) c;
      }
      PString[ plen ] = 0;
      if ((plen & 0x01) == 0)
      {
        c=ReadBlobByte(ifile);
        if (c == EOF)
          {
            PString=(unsigned char *) RelinquishMagickMemory(PString);
            return -1;
          }
      }
    }
    count=(ssize_t) ReadBlobMSBSignedLong(ifile);
    if ((count < 0) || (count > GetBlobSize(ifile)))
      {
        PString=(unsigned char *) RelinquishMagickMemory(PString);
         return -1;
       }
     /* make a buffer to hold the data and snag it from the input stream */
    str=(unsigned char *) AcquireQuantumMemory((size_t) count+1,sizeof(*str));
     if (str == (unsigned char *) NULL)
       {
         PString=(unsigned char *) RelinquishMagickMemory(PString);
        return 0;
      }
    for (i=0; i < (ssize_t) count; i++)
    {
      c=ReadBlobByte(ifile);
      if (c == EOF)
        {
          str=(unsigned char *) RelinquishMagickMemory(str);
          PString=(unsigned char *) RelinquishMagickMemory(PString);
          return -1;
        }
      str[i]=(unsigned char) c;
    }

    /* we currently skip thumbnails, since it does not make
     * any sense preserving them in a real world application
     */
    if (ID != THUMBNAIL_ID)
      {
        /* now finish up by formatting this binary data into
         * ASCII equivalent
         */
        if (strlen((const char *)PString) > 0)
          (void) FormatLocaleString(temp,MagickPathExtent,"8BIM#%d#%s=",ID,
            PString);
        else
          (void) FormatLocaleString(temp,MagickPathExtent,"8BIM#%d=",ID);
        (void) WriteBlobString(ofile,temp);
        if (ID == IPTC_ID)
          {
            formatString(ofile, "IPTC", 4);
            formatIPTCfromBuffer(ofile, (char *)str, (ssize_t) count);
          }
        else
          formatString(ofile, (char *)str, (ssize_t) count);
      }
    str=(unsigned char *) RelinquishMagickMemory(str);
    PString=(unsigned char *) RelinquishMagickMemory(PString);
    resCount++;
    c=ReadBlobByte(ifile);
  }
  return resCount;
}

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.