From 5e6a80d7a8e89e3172861602e3619616fa47b68d Mon Sep 17 00:00:00 2001
From: "Christian Holler (:decoder)" <choller@mozilla.com>
Date: Mon, 4 Sep 2023 15:25:22 +0000
Subject: [PATCH] Bug 1847728 - Handle nullptr in RemoteAccessible::ApplyCache.
 r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D185691
---
 accessible/ipc/RemoteAccessible.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/accessible/ipc/RemoteAccessible.cpp b/accessible/ipc/RemoteAccessible.cpp
index 69dee522e5fa..6fa97bd28460 100644
--- a/accessible/ipc/RemoteAccessible.cpp
+++ b/accessible/ipc/RemoteAccessible.cpp
@@ -183,6 +183,11 @@ RemoteAccessible* RemoteAccessible::RemoteParent() const {
 
 void RemoteAccessible::ApplyCache(CacheUpdateType aUpdateType,
                                   AccAttributes* aFields) {
+  if (!aFields) {
+    MOZ_ASSERT_UNREACHABLE("ApplyCache called with aFields == null");
+    return;
+  }
+
   const nsTArray<bool> relUpdatesNeeded = PreProcessRelations(aFields);
   if (auto maybeViewportCache =
           aFields->GetAttribute<nsTArray<uint64_t>>(CacheKey::Viewport)) {