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** Tags added: regression-update
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https://bugs.launchpad.net/bugs/1439186
Title:
[REGRESSION] Predictor tag fails to be written correctly
Status in tiff package in Ubuntu:
Confirmed
Status in tiff source package in Lucid:
Fix Released
Status in tiff source package in Precise:
Fix Released
Status in tiff source package in Trusty:
Fix Released
Status in tiff source package in Utopic:
Fix Released
Status in tiff source package in Vivid:
Confirmed
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
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