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xwm: Check whether the seat is NULL when needed in weston_wm_handle_button

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XCB and wayland input event handling exists together in xwm, which can
cause problems. weston_wm_handle_button is called via XCB events, while
it calls weston_wm_pick_seat_for_window, which uses info from compositor
(pure wayland). It is also true in setting and removing flags of frames.
Races can happen in between, when resize of moving flag of the frame is
still set while the button has been released, the picked seat will be
NULL in weston_wm_handle_button, causing crash. We can safely ignore
moving or resizing if this happens. The same applies to c06a180d.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=82827
Signed-off-by: Boyan Ding <stu_dby@126.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Boyan Ding 2014-09-03 17:25:30 +08:00 committed by Pekka Paalanen
parent de7e2b3ce3
commit 3c6d20c5eb
1 changed files with 4 additions and 2 deletions
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6
xwayland/window-manager.c
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@ -1648,12 +1648,14 @@ weston_wm_handle_button(struct weston_wm *wm, xcb_generic_event_t *event)
weston_wm_window_schedule_repaint(window);
if (frame_status(window->frame) & FRAME_STATUS_MOVE) {
shell_interface->move(window->shsurf, seat);
if (seat != NULL)
shell_interface->move(window->shsurf, seat);
frame_status_clear(window->frame, FRAME_STATUS_MOVE);
}
if (frame_status(window->frame) & FRAME_STATUS_RESIZE) {
shell_interface->resize(window->shsurf, seat, location);
if (seat != NULL)
shell_interface->resize(window->shsurf, seat, location);
frame_status_clear(window->frame, FRAME_STATUS_RESIZE);
}