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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>
This commit is contained in:
Bryce Harrington 2016-02-02 10:18:48 -08:00
parent 4061e2b67e
commit 2c40d1d30e
1 changed files with 4 additions and 1 deletions
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5
src/input.c
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@ -446,11 +446,14 @@ default_grab_touch_down(struct weston_touch_grab *grab, uint32_t time,
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,