[Bug 2018293] Re: [UBUNTU 20.04] Crash in zlib deflateBound() function on s390x

[Frank Heimes]

@comment #3
I assume that the build was not yet completed when you tried, since I kicked the builds off not long ago (the build is usually quick, but then it takes a while until the packages are moved to the right location).
But it's done now.
Alternatively you can also pick and wget the package(s) directly from here:
https://launchpad.net/~fheimes/+archive/ubuntu/lp2018293/+packages

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https://bugs.launchpad.net/bugs/2018293

Title:
  [UBUNTU 20.04] Crash in zlib deflateBound() function on s390x

Status in Ubuntu on IBM z Systems:
  Triaged
Status in zlib package in Ubuntu:
  In Progress
Status in zlib source package in Focal:
  New
Status in zlib source package in Jammy:
  New
Status in zlib source package in Lunar:
  New
Status in zlib source package in Mantic:
  In Progress

Bug description:
  SRU Justification:
  ==================

  [ Impact ]

   * The zlib deflateBound() function can crash on s390x,
     if called before deflateInit().

   * The solution is that zlib on s390x needs to support
     calling deflateBound() always before deflateInit().

  [ Test Plan ]

   * detailed instructions on how to reproduce/test the bug

   * these should allow someone who is not familiar with the affected
     package to reproduce the bug and verify that the updated package fixes
     the problem.

  [ Where problems could occur ]

   * The only (single line) modification is in the if condition
     of the define DEFLATE_BOUND_ADJUST_COMPLEN statement in
     deflate.c.

   * Things can go wrong if the condition (or logic) is wrong,

   * or if other parts of the code are coded against the old behavior
     and are still expecting it.

   * The likely outcome would be still a crash
     or an unexpected behavior.

  [ Other Info ]
   
   * Getting this into mantic first,
     before the SRU down to focal is done.
  __________

  Problem Description:
  zlib deflateBound() function can crash on s390x when called before deflateInit().

  Solution:
  zlib on s390x needs to support calling deflateBound() before deflateInit().

  The fix is squashed into the latest DFLTCC PR:
  https://github.com/madler/zlib/pull/410

  Diff:
  https://github.com/madler/zlib/compare/113203437eda67261848b14b6c80a33ff7e33d34..f6d382a91a4e7d88b9b12ce0ecdffb1783878160

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