From dfa69b82b4233494e65af53bdd620ab33e0c043a Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 4 Mar 2020 19:26:13 +0100
Subject: [PATCH] LibBareMetal: Don't try to print characters from a null
 pointer

---
 Libraries/LibBareMetal/Output/kprintf.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Libraries/LibBareMetal/Output/kprintf.cpp b/Libraries/LibBareMetal/Output/kprintf.cpp
index f064b49fd03..282b4afb31b 100644
--- a/Libraries/LibBareMetal/Output/kprintf.cpp
+++ b/Libraries/LibBareMetal/Output/kprintf.cpp
@@ -155,6 +155,8 @@ static void debugger_putch(char*&, char ch)
 
 extern "C" int dbgputstr(const char* characters, int length)
 {
+    if (!characters)
+        return 0;
     for (int i = 0; i < length; ++i)
         debugger_out(characters[i]);
     return 0;
@@ -162,6 +164,8 @@ extern "C" int dbgputstr(const char* characters, int length)
 
 extern "C" int kernelputstr(const char* characters, int length)
 {
+    if (!characters)
+        return 0;
     for (int i = 0; i < length; ++i)
         console_out(characters[i]);
     return 0;