From a4956591ec485e9b23ded32a853f2a63af92b769 Mon Sep 17 00:00:00 2001
From: riperiperi <rhy3756547@hotmail.com>
Date: Thu, 7 Oct 2021 01:13:51 +0100
Subject: [PATCH] Avoid potential race

---
 .../Memory/BufferModifiedRangeList.cs         | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs b/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
index faaccf13cf..b9b533fb73 100644
--- a/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
+++ b/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
@@ -324,9 +324,27 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// <param name="rangeAction">The action to call for each modified range</param>
         public void ReregisterRanges(Action<ulong, ulong> rangeAction)
         {
-            ulong currentSync = _context.SyncNumber;
-            foreach (BufferModifiedRange range in this)
+            ref var ranges = ref ThreadStaticArray<BufferModifiedRange>.Get();
+
+            // Range list must be consistent for this operation.
+            lock (_lock)
             {
+                if (ranges.Length < Count)
+                {
+                    Array.Resize(ref ranges, Count);
+                }
+
+                int i = 0;
+                foreach (BufferModifiedRange range in this)
+                {
+                    ranges[i++] = range;
+                }
+            }
+
+            ulong currentSync = _context.SyncNumber;
+            for (int i = 0; i < Count; i++)
+            {
+                BufferModifiedRange range = ranges[i];
                 if (range.SyncNumber != currentSync)
                 {
                     rangeAction(range.Address, range.Size);