From 5f4dbb2c71bbb2cb3b282b163fca9c3b09651719 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <tomoki.shirasawa.kk@hitachi-solutions.com>
Date: Tue, 5 Jun 2018 19:44:44 +0900
Subject: [PATCH] mprotect: Fix early exit condition on page table attribute

---
 kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/process.c b/kernel/process.c
index 377e0e08..54ae10cd 100644
--- a/kernel/process.c
+++ b/kernel/process.c
@@ -1445,7 +1445,7 @@ int change_prot_process_memory_range(struct process_vm *vm,
 	 */
 	if (range->memobj && (range->flag & VR_PRIVATE)) {
 		setattr &= ~PTATTR_WRITABLE;
-		if (clrattr == setattr == 0) {
+		if (!clrattr && !setattr) {
 			range->flag = newflag;
 			error = 0;
 			goto out;