From b1bfb848046e457f3cd623286b8cc1a5e5440023 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 17 Jan 2018 11:56:52 +0100
Subject: [PATCH] fs-util: extra safety checks on chase_symlinks() root
 parameter

Let's handle root="" and root="/" safely.
---
 src/basic/fs-util.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c
index 068f5660fa..15f9958c05 100644
--- a/src/basic/fs-util.c
+++ b/src/basic/fs-util.c
@@ -657,6 +657,14 @@ int chase_symlinks(const char *path, const char *original_root, unsigned flags,
          * function what to do when encountering a symlink with an absolute path as directory: prefix it by the
          * specified path. */
 
+        if (original_root) {
+                if (isempty(original_root)) /* What's this even supposed to mean? */
+                        return -EINVAL;
+
+                if (path_equal(original_root, "/")) /* A root directory of "/" is identical to none */
+                        original_root = NULL;
+        }
+
         if (original_root) {
                 r = path_make_absolute_cwd(original_root, &root);
                 if (r < 0)