[Bug 1988440] Re: Regression in 22.04: segmentation fault when language is spanish

[Steve Langasek]

Hello JOSE, or anyone else affected,

Accepted libxmlb into kinetic-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/libxmlb/0.3.8-1ubuntu0.1 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
kinetic to verification-done-kinetic. If it does not fix the bug for
you, please add a comment stating that, and change the tag to
verification-failed-kinetic. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: libxmlb (Ubuntu Kinetic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-kinetic

** Changed in: libxmlb (Ubuntu Jammy)
       Status: In Progress => Fix Committed

** Tags added: verification-needed-jammy

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https://bugs.launchpad.net/bugs/1988440

Title:
  Regression in 22.04: segmentation fault when language is spanish

Status in snap-store-desktop:
  Fix Released
Status in libxmlb package in Ubuntu:
  Fix Released
Status in libxmlb source package in Bionic:
  Won't Fix
Status in libxmlb source package in Focal:
  Fix Committed
Status in libxmlb source package in Jammy:
  Fix Committed
Status in libxmlb source package in Kinetic:
  Fix Committed

Bug description:
  The discussion here describes the issue in full detail:
  https://forum.snapcraft.io/t/segment-fault-with-snap-store/31547

  The bug was caused by a double-free in libxmlb, triggered by some
  specific data combination.

  [Impact] This bug has been in the library since, at least, version
  0.1.8, the one used in Bionic. Although the patch attached here fixes
  the problem in the "snap-store" snap, the bug is still present in the
  libraries distributed as .deb in Ubuntu, and also in the GNOME-42
  extension snap. A patch has been sent both to the libxmlb repository
  (which has been accepted and merged) and to the Debian SALSA
  repository.

  [Test plan] To test this bug, just download the GIT repository
  https://github.com/sergio-costas/test_libxmlb2 and follow the
  instructions. If the bug is there, valgrind will show an access to an
  already freed memory block and six CRITICAL errors will be shown by
  GLib.

  [Where problems could occur] If another developer adds code that uses
  the 'xb_builder_xml_lang_prio_cb()' function and forgets to define a
  destruction function for the passed 'nodes_to_destroy' ptr_array,
  there would be a memory leak.

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