From d014293f6d93a34ea021ce287030a1f575f403c3 Mon Sep 17 00:00:00 2001
From: Hannah von Reth <hannah.vonreth@owncloud.com>
Date: Tue, 5 Jan 2021 17:43:31 +0100
Subject: [PATCH] Ensure pathtoUNC is called with an absolute path

---
 src/common/filesystembase.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/common/filesystembase.cpp b/src/common/filesystembase.cpp
index 9c3c33f30..8bbca4922 100644
--- a/src/common/filesystembase.cpp
+++ b/src/common/filesystembase.cpp
@@ -18,6 +18,7 @@
 
 #include "filesystembase.h"
 #include "utility.h"
+#include "common/asserts.h"
 
 #include <QDateTime>
 #include <QDir>
@@ -509,6 +510,7 @@ bool FileSystem::isJunction(const QString &filename)
 #ifdef Q_OS_WIN
 QString FileSystem::pathtoUNC(const QString &_str)
 {
+    ASSERT(QFileInfo(_str).isAbsolute());
     if (_str.isEmpty()) {
         return _str;
     }
@@ -522,6 +524,7 @@ QString FileSystem::pathtoUNC(const QString &_str)
     // prepend \\?\ and to support long names
 
     if (str.at(0) == sep) {
+        // should not happen as we require the path to be absolute
         return QStringLiteral(R"(\\?)") + str;
     }
     return QStringLiteral(R"(\\?\)") + str;