desktop-packages team mailing list archive
-
desktop-packages team
-
Mailing list archive
-
Message #110595
[Bug 1439186] Re: [REGRESSION] Predictor tag fails to be written correctly
After a few trial and error session, I think the attached patch to
replace debian/patches/CVE-2014-8128-5.patch should fix this reported
problem.
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-8128
** Patch added: "Fixed version of the patch causing problem"
https://bugs.launchpad.net/ubuntu/+source/tiff/+bug/1439186/+attachment/4363109/+files/CVE-2014-8128-5-fixed.patch
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to tiff in Ubuntu.
https://bugs.launchpad.net/bugs/1439186
Title:
[REGRESSION] Predictor tag fails to be written correctly
Status in tiff package in Ubuntu:
New
Bug description:
The patch debian/patches/CVE-2014-8128-5.patch appears to break saving TIFF files with compression predictor.
It seems the data is correctly saved, but the "predictor" tag is not, which prevents reading the data correctly again.
This happens both on precise (release 3.9.5-2ubuntu1.7) and on trusty
(release 4.0.3-7ubuntu0.2).
I'm attaching an example TIFF file "small.tiff" for showing the
behaviour. It is compressed in LZW without predictor, so it is
written/read correctly.
However, if you recompress it with this command, the error happens:
$ tiffcp -c lzw:2 small.tiff small-c2.tiff
Then displaying it in eog shows a completely different image. Tiffinfo indicates a problem with the tags:
$ tiffinfo small-c2-bad.tiff | grep Predictor
TIFFReadDirectory: Warning, small-c2-bad.tiff: unknown field with tag 8224 (0x2020) encountered.
Comparing it with a good version of the file (generated with a previous version of libtiff):
$ tiffinfo small-c2-good.tiff | grep Predictor
Predictor: horizontal differencing 2 (0x2)
$ tiffcmp small-c2.tiff small-c2-good.tiff
TIFFReadDirectory: Warning, small-c2-bad.tiff: unknown field with tag 8224 (0x2020) encountered.
Predictor tag appears only in small-c2-good.tiff
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/tiff/+bug/1439186/+subscriptions
References