input: Fix crash when touchscreen generates out of screen coordinate
With change 61ed7b6b, global touch coordinates are being passed to the
touch grab. However, touch->grab is undefined in certain circumstances
such as when the touch screen raises an axis X value larger than the
maximum expected. Move the check for this condition earlier, before our
first use of the pointer.
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=92736
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
diff --git a/src/input.c b/src/input.c
index 2539fa7..8c106dd 100644
--- a/src/input.c
+++ b/src/input.c
@@ -446,11 +446,14 @@
struct wl_list *resource_list;
wl_fixed_t sx, sy;
+ if (!touch->focus)
+ return;
+
weston_view_from_global_fixed(touch->focus, x, y, &sx, &sy);
resource_list = &touch->focus_resource_list;
- if (!wl_list_empty(resource_list) && touch->focus) {
+ if (!wl_list_empty(resource_list)) {
serial = wl_display_next_serial(display);
wl_resource_for_each(resource, resource_list)
wl_touch_send_down(resource, serial, time,