From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Lan Wei <lanwei@chromium.org>
Date: Fri, 16 Apr 2021 03:49:10 +0000
Subject: Add null pointer check in RenderWidgetHostInputEventRouter

We have some crashes in RenderWidgetHostInputEventRouter class, we are
adding some null pointer check in this class to avoid the crash.

(cherry picked from commit 5f47666b79ac7ded20e1c7657037498561bd3352)

Bug: 1155297
Change-Id: I3b63d5748523ae2ce8ab469832adfc75d586e411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2818680
Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#871108}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2830091
Auto-Submit: Lan Wei <lanwei@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/branch-heads/4430@{#1296}
Cr-Branched-From: e5ce7dc4f7518237b3d9bb93cccca35d25216cbe-refs/heads/master@{#857950}

diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.cc b/content/browser/renderer_host/render_widget_host_input_event_router.cc
index dfd11a52b2d7e8724423ffb37686e5904a96e861..7e309490d675c5dbebe447896b30f0d9cc0bd1d6 100644
--- a/content/browser/renderer_host/render_widget_host_input_event_router.cc
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.cc
@@ -1958,7 +1958,7 @@ void RenderWidgetHostInputEventRouter::OnAggregatedHitTestRegionListUpdated(
     const std::vector<viz::AggregatedHitTestRegion>& hit_test_data) {
   for (auto& region : hit_test_data) {
     auto iter = owner_map_.find(region.frame_sink_id);
-    if (iter != owner_map_.end())
+    if (iter != owner_map_.end() && iter->second)
       iter->second->NotifyHitTestRegionUpdated(region);
   }
 }