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

[Brian Murray]

If this needs SRU'ing to impish please update the bug description
accordingly. I've sponsored this for Jammy.

** Changed in: zlib (Ubuntu Jammy)
       Status: New => In Progress

** Changed in: zlib (Ubuntu Jammy)
     Assignee: Skipper Bug Screeners (skipper-screen-team) => Brian Murray (brian-murray)

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

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

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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