** Branch linked: lp:ubuntu/vivid-proposed/tiff -- You received this bug notification because you are a member of Ubuntu Touch seeded 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: Confirmed Status in tiff source package in Lucid: Confirmed Status in tiff source package in Precise: Confirmed Status in tiff source package in Trusty: Confirmed Status in tiff source package in Utopic: Confirmed 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/tiff/+bug/1439186/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp