From 03e73a731288a1d463ae0ff9ed3756b54c0bafa2 Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Tue, 24 Sep 2019 17:38:26 +0900
Subject: [PATCH] Disable interrupts while we don't have a valid stack in
 task_switch()

---
 kernel/arch/task.S | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/arch/task.S b/kernel/arch/task.S
index faed92a..9f6a190 100644
--- a/kernel/arch/task.S
+++ b/kernel/arch/task.S
@@ -158,7 +158,7 @@ task_switch:
 	movl	4(%esp), %edi
 
 	cmpl	%esi, %edi
-	jnz		2f
+	jne		2f
 	/* FIXME: Return -EALREADY instead */
 	movl	$-1, %eax
 	ret
@@ -170,6 +170,12 @@ task_switch:
 	cmpl	%ecx, %edx
 	jz		2f
 
+	/*
+	 * Clear interrupts, since we won't have a valid stack until the
+	 * iret instruction in _int_restore is executed
+	 */
+	cli
+
 	/* switch page directory */
 	movl	%ecx, %cr3
 
-- 
2.47.3