[Bug 1638835] Re: mate-screenshot crashed with SIGSEGV in gdk_property_get()

[Vlad Orlov]

[Impact]

Making screenshot of the current window might result
in mate-screenshot crashing.

The fix for this issue is provided in the debdiffs
attached to the report.

Would be nice to have the fix backported to Zesty and
Artful, as the issue breaks one of the common features
that users expect to work always.

[Test Case]

Use Alt-PrintScreen (or "mate-screenshot -w" from the
terminal) to grab the current window.

As stated in the original description, this should be
tried on PowerPC machines to reproduce the bug reliably.
In this case, mate-screenshot should crash.
Intel/AMD machines may or may not be affected.

[Regression Potential]

The fix is achieved by removing some unneeded code from
mate-screenshot. The code was obtaining window title
from the current window, but that title wasn't used by
any other parts of code afterwards. The only effect of
removing that code is fixing the crash, as it happened
exactly in that part. Therefore, there's no place for
regressions here.

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https://bugs.launchpad.net/bugs/1638835

Title:
  mate-screenshot crashed with SIGSEGV in gdk_property_get()

Status in mate-utils package in Ubuntu:
  Confirmed

Bug description:
  mate-screenshot always crashes when doing a 'grab the current
  window'-screenshot. Doing a screenshot of the whole desktop works.
  Tested on Zestys daily iso on a PowerBook G4 5,6.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.04
  Package: mate-utils 1.16.0-1
  ProcVersionSignature: Ubuntu 4.8.0-26.28-powerpc-smp 4.8.0
  Uname: Linux 4.8.0-26-powerpc-smp ppc
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: powerpc
  CurrentDesktop: MATE
  Date: Thu Nov  3 09:45:07 2016
  ExecutablePath: /usr/bin/mate-screenshot
  InstallationDate: Installed on 2016-11-03 (0 days ago)
  InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Alpha powerpc (20161103)
  ProcCmdline: mate-screenshot --interactive
  ProcEnviron:
   LANGUAGE=de_AT:de
   PATH=(custom, user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_AT.UTF-8
   SHELL=/bin/bash
  Signal: 11
  SourcePackage: mate-utils
  StacktraceTop:
   gdk_property_get () from /usr/lib/powerpc-linux-gnu/libgdk-3.so.0
   screenshot_get_window_title ()
   ?? ()
   ?? ()
   ?? () from /lib/powerpc-linux-gnu/libglib-2.0.so.0
  Title: mate-screenshot crashed with SIGSEGV in gdk_property_get()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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