From 9cac98c2abfae92088763e78e794e30984e8e4b6 Mon Sep 17 00:00:00 2001
From: Mike Wasserman <[email protected]>
Date: Thu, 03 Sep 2026 17:38:56 -0700
Subject: [PATCH] Fullscreen: Ignore display ids without Window Management permission

Adds an extra layer of protection for compromised renderers

Fixed: 501896592
Change-Id: Ic9986c3c1883f28308f6dbac9bc99141821eac25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8355032
Reviewed-by: Vikram Pasupathy <[email protected]>
Commit-Queue: Vikram Pasupathy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1692074}
---
diff --git a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
index 5b198cf..1e0d665 100644
--- a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
+++ b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
@@ -604,6 +604,7 @@
                       requesting_frame) !=
               blink::mojom::PermissionStatus::GRANTED) {
         display_id = display::kInvalidDisplayId;
+        fullscreen_tab_params.display_id = display::kInvalidDisplayId;
       } else if (entering_tab_fullscreen) {
         display_id_prior_to_tab_fullscreen_ = current_display;
       }