[Bug 1893170] Re: [Ubuntu 20.10] zlib: DFLTCC compression level switching issues

[Michael Hudson-Doyle]

Great thanks for testing. I've uploaded to groovy -- th ext step is to
SRU to focal I guess -- can you provide an impact statement / test case
/ regression potential as described at
https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template ?

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Title:
  [Ubuntu 20.10] zlib: DFLTCC compression level switching issues

Status in Ubuntu on IBM z Systems:
  In Progress
Status in zlib package in Ubuntu:
  New
Status in zlib source package in Focal:
  New
Status in zlib source package in Groovy:
  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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