[Wayland-bugs] [Bug 91886] Weston (1.8.92) segfaults during tear-down due to deletion of NULL `backend`, when using RPi backend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91886

            Bug ID: 91886
           Summary: Weston (1.8.92) segfaults during tear-down due to
                    deletion of NULL `backend`, when using RPi backend
           Product: Wayland
           Version: unspecified
          Hardware: ARM
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: weston
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: deathofathousandpapercuts at gmail.com

Created attachment 118088
  --> https://bugs.freedesktop.org/attachment.cgi?id=118088&action=edit
Patch to prevent segfault in teardown when using RPi backend

When running with the RPi backend, Weston sefaults during shutdown. This is due
to the fact that `compositor->backend` is never initialised, and there is no
NULL check prior to calling `destroy()`.

I'm attaching a small patch that fixes the issue by making
`rpi_backend_create()` intialise `compositor->backend` - just like the X11
backend does. Please consider this patch for inclusion on master.

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