Subject: Really fix directory traversal
Author: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
Forwarded: https://github.com/openfibernet/tftp-proxy/pull/3
Date: 2024-02-08

--- a/main.go
+++ b/main.go
@@ -18,7 +18,7 @@
 
 // readHandler is called when client starts file download from server
 func readHandler(filename string, rf io.ReaderFrom) error {
-	file_path := filepath.Clean(path.Join(dir, filename))
+	file_path := path.Join(dir, filepath.Clean(path.Join("/", filename)))
 
 	if _, err := os.Stat(file_path); err == nil {
 		file, err := os.Open(file_path)