From 635e0cdb588bb5b9398c2d11e6f61a90c38ca742 Mon Sep 17 00:00:00 2001
From: CrazyMax <crazy-max@users.noreply.github.com>
Date: Fri, 15 Sep 2023 20:43:51 +0200
Subject: [PATCH] copy: fix nil pointer dereference when checking compression
 algorithm

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
---
 copy/single.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/copy/single.go b/copy/single.go
index 02651bd4cb..918e756c2a 100644
--- a/copy/single.go
+++ b/copy/single.go
@@ -380,8 +380,9 @@ func (ic *imageCopier) compareImageDestinationManifestEqual(ctx context.Context,
 
 	compressionAlgos := set.New[string]()
 	for _, srcInfo := range ic.src.LayerInfos() {
-		compression := compressionAlgorithmFromMIMEType(srcInfo)
-		compressionAlgos.Add(compression.Name())
+		if c := compressionAlgorithmFromMIMEType(srcInfo); c != nil {
+			compressionAlgos.Add(c.Name())
+		}
 	}
 
 	algos, err := algorithmsByNames(compressionAlgos.Values())