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seat: guard against button count corruption

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This is still a compositor bug, and bad events will be sent to clients. We'll
need to track each button separately to handle this in wlroots.
This commit is contained in:
emersion 2019-02-28 18:58:02 +01:00 committed by Brian Ashworth
parent f8fcd7f06a
commit 4135fafecd
1 changed files with 5 additions and 1 deletions
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4
types/seat/wlr_seat_pointer.c
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@ -345,9 +345,13 @@ uint32_t wlr_seat_pointer_notify_button(struct wlr_seat *wlr_seat,
wlr_seat->pointer_state.grab_time = time; wlr_seat->pointer_state.grab_time = time;
} }
wlr_seat->pointer_state.button_count++; wlr_seat->pointer_state.button_count++;
} else {
if (wlr_seat->pointer_state.button_count == 0) {
wlr_log(WLR_ERROR, "Corrupted seat button count");
} else { } else {
wlr_seat->pointer_state.button_count--; wlr_seat->pointer_state.button_count--;
} }
}
struct wlr_seat_pointer_grab *grab = wlr_seat->pointer_state.grab; struct wlr_seat_pointer_grab *grab = wlr_seat->pointer_state.grab;
uint32_t serial = grab->interface->button(grab, time, button, state); uint32_t serial = grab->interface->button(grab, time, button, state);