From 4c1f33b169b74dce2af414db30fcf113c4bf2a56 Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Mon, 10 Sep 2018 22:12:07 +0200
Subject: Bug 1470260 - Part 1: Ensure that 'this' stays alive for the duration
 of the TickRefreshDriver call.

---
 layout/base/nsRefreshDriver.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'layout/base')

diff --git a/layout/base/nsRefreshDriver.cpp b/layout/base/nsRefreshDriver.cpp
index bc1a27852..8a62b517e 100644
--- a/layout/base/nsRefreshDriver.cpp
+++ b/layout/base/nsRefreshDriver.cpp
@@ -478,6 +478,9 @@ private:
 
     bool NotifyVsync(TimeStamp aVsyncTimestamp) override
     {
+      // IMPORTANT: All paths through this method MUST hold a strong ref on
+      // |this| for the duration of the TickRefreshDriver callback.
+
       if (!NS_IsMainThread()) {
         MOZ_ASSERT(XRE_IsParentProcess());
         // Compress vsync notifications such that only 1 may run at a time
@@ -498,6 +501,7 @@ private:
                                           aVsyncTimestamp);
         NS_DispatchToMainThread(vsyncEvent);
       } else {
+        RefPtr<RefreshDriverVsyncObserver> kungFuDeathGrip(this);
         TickRefreshDriver(aVsyncTimestamp);
       }
 
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