[Bug 1961427] Re: [Ubuntu 21.10] zlib: compressBound() returns an incorrect result on z15

[Frank Heimes]

debdiff for zlib_1.2.11.dfsg-2ubuntu7 to zlib_1.2.11.dfsg-2ubuntu8
(except the of the top line of the changelog:
zlib (1:1.2.11.dfsg-2ubuntu8) impish; urgency=medium
the debdiff is the same for impish and jammy)

  * d/p/410-lp1961427.patch ported from zlib #410, fixing
    compressBound() with hw acceleration. LP: #1961427
    Refreshed some quilt patches just to remove offsets.
    Thanks to Ilya Leoshkevich <iii at linux.ibm.com>.

** Patch added: "zlib_1.2.11.dfsg-2ubuntu7_to_zlib_1.2.11.dfsg-2ubuntu8 (jammy)"
   https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/1961427/+attachment/5567534/+files/debdiff_zlib_1.2.11.dfsg-2ubuntu7_to_zlib_1.2.11.dfsg-2ubuntu8_jammy.diff

** Also affects: zlib (Ubuntu Jammy)
   Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
       Status: New

** Also affects: zlib (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Summary changed:

- [Ubuntu 21.10] zlib: compressBound() returns an incorrect result on z15
+ zlib: compressBound() returns an incorrect result on z15

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https://bugs.launchpad.net/bugs/1961427

Title:
  zlib: compressBound() returns an incorrect result on z15

Status in Ubuntu on IBM z Systems:
  New
Status in zlib package in Ubuntu:
  New
Status in zlib source package in Impish:
  New
Status in zlib source package in Jammy:
  New

Bug description:
  Description:   zlib: compressBound() returns an incorrect result on z15
  Symptom:       Passing the result of compressBound() to compress()
                 results in an error code.
  Problem:       compressBound() is not adjusted for DFLTCC.
  Solution:      Adjust compressBound() for DFLTCC like it's already done
                 for deflateBound(). 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 b25781e735363e04f6c56e21431c47e4afc50b17.

  Reproduction:  z15 only:
                 #include <assert.h>
                 #include <stdlib.h>
                 #include <zlib.h>
                 int main() {
                     Bytef in_buf[128], out_buf[1024];
                     for (size_t i = 0; i < sizeof(in_buf); i++)
                         in_buf[i] = rand();
                     uLongf dest_len = compressBound(sizeof(in_buf));
                     assert(dest_len <= sizeof(out_buf));
                     int ret = compress(out_buf, &dest_len,
                                        in_buf, sizeof(in_buf));
                     assert(ret == Z_OK);
                 }

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