From 766c8e3ffd0bf9f85e0ddee02636d107b1e4288c Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Fri, 11 Feb 2022 13:06:02 +0000
Subject: [PATCH] [DOM] Lock around memory reporting for XHR

---
 dom/xhr/XMLHttpRequestString.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dom/xhr/XMLHttpRequestString.h b/dom/xhr/XMLHttpRequestString.h
index b02040b7ea..4a87aa4d8a 100644
--- a/dom/xhr/XMLHttpRequestString.h
+++ b/dom/xhr/XMLHttpRequestString.h
@@ -201,8 +201,9 @@ public:
   }
 
   size_t
-  SizeOfThis(MallocSizeOf aMallocSizeOf) const
+  SizeOfThis(MallocSizeOf aMallocSizeOf)
   {
+    MutexAutoLock lock(mMutex);
     return mData.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
   }