exif int overflow patch is not applied to 5.3?

Hi all, 5.4.24/5.5.8 have this patch diff --git a/ext/exif/exif.c b/ext/exif/exif.c index 2fe54f7..c531d8d 100644 --- a/ext/exif/exif.c +++ b/ext/exif/exif.c @@ -2852,7 +2852,12 @@ static int exif_process_IFD_TAG(image_info_type *ImageInfo, char *dir_entry, cha offset_val = php_ifd_get32u(dir_entry+8, ImageInfo->motorola_intel); /* If its bigger than 4 bytes, the dir entry contains an offset. */ value_ptr = offset_base+offset_val; - if (byte_count > IFDlength || offset_val > IFDlength-byte_count || value_ptr < dir_entry) { + /* + dir_entry is ImageInfo->file.list[sn].data+2+i*12 + offset_base is ImageInfo->file.list[sn].data-dir_offset + dir_entry - offset_base is dir_offset+2+i*12 + */ + if (byte_count > IFDlength || offset_val > IFDlength-byte_count || value_ptr < dir_entry || offset_val < (size_t)(dir_entry-offset_base)) /* It is important to check for IMAGE_FILETYPE_TIFF * JPEG does not use absolute pointers instead its pointers are * relative to the start of the TIFF header in APP1 section. */ https://bugs.php.net/bug.php?id=65873 Is this applicable to 5.3, isn't this? I don't understand details of this patch, but it sounds this is required fix for 5.3. Could anyone give clarification? Thank you. -- Yasuo Ohgaki yohgaki@ohgaki.net