core: reject bogus PresentCompleteNotify

Upstream bug report: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1418 Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
yshui · Dec 16, 2022 · dfa9dbe · dfa9dbe
1 parent ee66392
commit dfa9dbe
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/src/picom.c b/src/picom.c
@@ -1525,8 +1525,9 @@ handle_present_complete_notify(session_t *ps, xcb_present_complete_notify_event_
 		set_cant_fail_cookie(ps, cookie);
 	}
 
-	if (cne->msc <= ps->last_msc) {
-		// X sometimes sends duplicate MSC events, ignore them
+	if (cne->msc <= ps->last_msc || cne->ust == 0) {
+		// X sometimes sends duplicate/bogus MSC events, ignore them
+		// See: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1418
 		return;
 	}