From 33e7df595505d0b52eab633ab5503b2318ee1461 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Fri, 1 Feb 2019 15:24:42 +0100
Subject: Kernel: mkdir() should fail if the pathname is empty.

---
 Kernel/Process.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 901c16f711..6c5745530c 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -1863,10 +1863,13 @@ int Process::sys$mkdir(const char* pathname, mode_t mode)
 {
     if (!validate_read_str(pathname))
         return -EFAULT;
-    if (strlen(pathname) >= 255)
+    size_t pathname_length = strlen(pathname);
+    if (pathname_length == 0)
+        return -EINVAL;
+    if (pathname_length >= 255)
         return -ENAMETOOLONG;
     int error;
-    if (!VFS::the().mkdir(pathname, mode, cwd_inode()->identifier(), error))
+    if (!VFS::the().mkdir(String(pathname, pathname_length), mode, cwd_inode()->identifier(), error))
         return error;
     return 0;
 }
-- 
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