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** Attachment added: "patch"
https://bugs.launchpad.net/bugs/1893170/+attachment/5405063/+files/patch
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => zlib (Ubuntu)
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https://bugs.launchpad.net/bugs/1893170
Title:
[Ubuntu 20.10] zlib: DFLTCC compression level switching issues
Status in zlib package in Ubuntu:
New
Bug description:
Description: zlib: DFLTCC compression level switching issues
Symptom: Switching compression levels corrupts data
Problem: Hardware and software compression states become desynchronized.
Solution: Improve compression state synchronization. Since zlib project
does not accept patches at the moment, the fix has been
integrated into the DFLTCC pull request:
https://github.com/madler/zlib/pull/410
The commitid is 992a7afc3edfa511dff0650d1c545b11bf64e655.
Reproduction: Not possible with popular command line tools. The issues were
discovered using example_call_fuzzer from:
https://github.com/iii-i/zlib-ng/tree/fuzz/test/fuzz/
This needs also be applied against 20.04 !
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