Rootston crashes when used with tablet tool

[wsinnema]

Rootston crashes when I do the following:

• Open termite
• Point a stylus on termite
• Put the stylus out of range for the screen
• Rootston crashes because tool->tool is NULL in handle_tablet_tool_v2_set_cursor

Core dump for commit 9e49ceb12985697fbfc0b2fa8f86143b29cc837b

[emersion]

Please provide a stack trace

[wsinnema]

#0 0x00007f1200423d62 in wl_signal_emit (signal=0x120, data=0x7ffdd8410a50) at /usr/include/wayland-server-core.h:467
#1 0x00007f1200424213 in handle_tablet_tool_v2_set_cursor (client=0x556f785e5000, resource=0x556f78554eb0, serial=8, surface_resource=0x556f785c2c90, hotspot_x=4, hotspot_y=4) at ../types/tablet_v2/wlr_tablet_v2_tool.c:47
#2 0x00007f11ffa356d0 in ffi_call_unix64 () at /lib64/libffi.so.6
#3 0x00007f11ffa350a0 in ffi_call () at /lib64/libffi.so.6
#4 0x00007f12003c46ff in () at /lib64/libwayland-server.so.0
#5 0x00007f12003c10a3 in () at /lib64/libwayland-server.so.0
#6 0x00007f12003c2702 in wl_event_loop_dispatch () at /lib64/libwayland-server.so.0
#7 0x00007f12003c12ac in wl_display_run () at /lib64/libwayland-server.so.0
#8 0x0000556f763e4686 in main (argc=1, argv=0x7ffdd8411128) at ../rootston/main.c:74

[wsinnema]

It only happens on GTK applications, everything works fine on Konsole and Rootston (as client), but not with Termite and Epiphany

[Ongy]

Nothing immediatly obvious.
Can't reproduce with gedit, and debug log shows the set_cursor calls.

Can you check valgrind and provide the client WAYLAND_DEBUG log?

[wsinnema]

valgrind.txt
client.txt