From e011450a90380015893f12f1f5d27aecd8e021ee Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Sun, 21 Nov 2021 15:15:24 +0100
Subject: [PATCH] Dispose cost manager and hashChainBox

---
 .../Formats/Webp/Lossless/BackwardReferenceEncoder.cs         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp/Formats/Webp/Lossless/BackwardReferenceEncoder.cs b/src/ImageSharp/Formats/Webp/Lossless/BackwardReferenceEncoder.cs
index 82aa3ff7b1..c394a8caa8 100644
--- a/src/ImageSharp/Formats/Webp/Lossless/BackwardReferenceEncoder.cs
+++ b/src/ImageSharp/Formats/Webp/Lossless/BackwardReferenceEncoder.cs
@@ -114,6 +114,8 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
 
             BackwardReferences2DLocality(width, best);
 
+            hashChainBox?.Dispose();
+
             return best;
         }
 
@@ -281,7 +283,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
             }
 
             costModel.Build(xSize, cacheBits, refs);
-            var costManager = new CostManager(memoryAllocator, distArrayBuffer, pixCount, costModel);
+            using var costManager = new CostManager(memoryAllocator, distArrayBuffer, pixCount, costModel);
             Span<float> costManagerCosts = costManager.Costs.GetSpan();
             Span<ushort> distArray = distArrayBuffer.GetSpan();