From 0e5c5f52c516317253641d8153321d0e157df5e8 Mon Sep 17 00:00:00 2001
From: Ingo Oppermann <ingo@datarhei.com>
Date: Thu, 14 Mar 2024 11:18:45 +0100
Subject: [PATCH] Add lock for accessing files map

---
 io/fs/mem.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/io/fs/mem.go b/io/fs/mem.go
index 9a055022..9b03214e 100644
--- a/io/fs/mem.go
+++ b/io/fs/mem.go
@@ -268,7 +268,9 @@ func (fs *memFilesystem) Open(path string) File {
 	}
 
 	if len(file.linkTo) != 0 {
+		fs.filesLock.RLock()
 		file, ok = fs.files[file.linkTo]
+		fs.filesLock.RUnlock()
 		if !ok {
 			return nil
 		}
@@ -293,7 +295,9 @@ func (fs *memFilesystem) ReadFile(path string) ([]byte, error) {
 	}
 
 	if len(file.linkTo) != 0 {
+		fs.filesLock.RLock()
 		file, ok = fs.files[file.linkTo]
+		fs.filesLock.RUnlock()
 		if !ok {
 			return nil, ErrNotExist
 		}