From bb36197cd28c0baeabbdf611412e362abd5e415e Mon Sep 17 00:00:00 2001
From: Doczom <Doczom@kolibrios.org>
Date: Sat, 23 Oct 2021 15:53:35 +0000
Subject: [PATCH] fix bug http://bugs.kolibrios.org/view.php?id=145 in sf 4

git-svn-id: svn://kolibrios.org@9222 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 kernel/trunk/kernel.asm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index 0a90b6cd71..1844c4c04a 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -5212,8 +5212,14 @@ align 4
 
 syscall_writetext:                      ; WriteText
 
+        push    esi    ;check pointer on kernel address.
+        test    ecx, 0x80000000
+        jz      @f
+        mov     esi, 0
+@@:
         stdcall is_region_userspace, edx, esi
         jnz     .err
+        pop     esi
 
         mov     eax, [TASK_BASE]
         mov     ebp, [eax-twdw+WDATA.box.left]