From c14e6c05b97e83387bc3f311f230a350b331c366 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Tue, 17 Jul 2018 15:43:09 +0200
Subject: [PATCH] Fix waitpid(2) when the status pointer is NULL.

---
 kernel/process.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/process.cpp b/kernel/process.cpp
index ced2f755..69730c24 100644
--- a/kernel/process.cpp
+++ b/kernel/process.cpp
@@ -518,7 +518,9 @@ pid_t sys_waitpid(pid_t pid, int* user_status, int options)
 {
 	int status = 0;
 	pid_t ret = CurrentProcess()->Wait(pid, &status, options);
-	if ( 0 < ret && !CopyToUser(user_status, &status, sizeof(status)) )
+	if ( 0 < ret &&
+	     user_status &&
+	     !CopyToUser(user_status, &status, sizeof(status)) )
 		return -1;
 	return ret;
 }