I could crash Weston by trying to open another menu from a panel while
one menu from it was already showing.
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff40a9872 in popup_grab_focus (grab=0x761968, time=
4130706528, surface=0x0, x=-227, y=15) at shell.c:440
440 if (surface->resource.client == client) {
(gdb) bt
0 0x00007ffff40a9872 in popup_grab_focus (grab=0x761968, time=
4130706528, surface=0x0, x=-227, y=15) at shell.c:440
1 0x0000000000406977 in weston_device_repick (device=0x70b4e0, time=
4130706528) at compositor.c:360
2 0x0000000000406a36 in weston_compositor_repick (compositor=0x619960) at compositor.c:382
3 0x0000000000406ac8 in destroy_surface (resource=0x6fc6f0) at compositor.c:397
4 0x00007ffff7bd33d8 in destroy_resource (element=0x6fc6f0, data=0x7fffffffd9fc) at wayland-server.c:355
5 0x00007ffff7bd8d98 in for_each_helper (entries=0x757808, func=0x7ffff7bd332c <destroy_resource>, data=0x7fffffffd9fc)
at wayland-util.c:264
6 0x00007ffff7bd8dd4 in wl_map_for_each (map=0x757808, func=0x7ffff7bd332c <destroy_resource>, data=0x7fffffffd9fc)
at wayland-util.c:270
7 0x00007ffff7bd34dc in wl_client_destroy (client=0x7577d0) at wayland-server.c:385
8 0x00007ffff7bd2e36 in wl_client_connection_data (fd=17, mask=1, data=0x7577d0) at wayland-server.c:187
9 0x00007ffff7bd5bde in wl_event_source_fd_dispatch (source=0x74cda0, ep=0x7fffffffdae0) at event-loop.c:76
10 0x00007ffff7bd665b in wl_event_loop_dispatch (loop=0x618900, timeout=-1) at event-loop.c:462
11 0x00007ffff7bd42a9 in wl_display_run (display=0x6188b0) at wayland-server.c:785
12 0x000000000040b1e1 in main (argc=1, argv=0x7fffffffdef8) at compositor.c:2182
Modify popup_grab_focus() to deal with a NULL surface.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>