[Wayland-bugs] [Bug 92736] Weston crash when touch->focus null

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92736

--- Comment #2 from Guanghua Tan <starxforever at live.com> ---
After debug into weston codes, I find this crash issue is really caused by
following commit:

   input: pass the global touch coordinates to the touch grab

in this commit, a call to "weston_view_from_global_fixed" is added but no check
to touch->focus.

weston will crash when touch->focus is null.

It do have the null check on touch->focus before call to "wl_touch_send_down".

this crash only happens in "default_grab_touch_down()".

so i solved it as attached patch file shows.

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