From a316ca0e0df40f9d08c566fc212517a9c54fb22e Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Thu, 22 Oct 2020 18:59:00 +0200
Subject: [PATCH] TmpFS: Don't allow file names longer than NAME_MAX

Fixes #3636.
---
 Kernel/FileSystem/TmpFS.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Kernel/FileSystem/TmpFS.cpp b/Kernel/FileSystem/TmpFS.cpp
index 2109cfce2a..54f2b77d09 100644
--- a/Kernel/FileSystem/TmpFS.cpp
+++ b/Kernel/FileSystem/TmpFS.cpp
@@ -27,6 +27,7 @@
 #include <Kernel/FileSystem/TmpFS.h>
 #include <Kernel/Process.h>
 #include <Kernel/Thread.h>
+#include <LibC/limits.h>
 
 namespace Kernel {
 
@@ -297,6 +298,9 @@ KResult TmpFSInode::add_child(Inode& child, const StringView& name, mode_t)
     ASSERT(is_directory());
     ASSERT(child.fsid() == fsid());
 
+    if (name.length() > NAME_MAX)
+        return KResult(-ENAMETOOLONG);
+
     m_children.set(name, { name, static_cast<TmpFSInode&>(child) });
     did_add_child(child.identifier());
     return KSuccess;