From 81ef5294de16ef6c8fec8a8aab509212d2240623 Mon Sep 17 00:00:00 2001
From: Xie XiuQi <xiexiuqi@huawei.com>
Date: Tue, 29 Jan 2019 17:38:38 +0800
Subject: [PATCH] arm64/mpam: mon: add WARN_ON for debug free_pmg

hulk inclusion
category: feature
bugzilla: 5510
CVE: NA

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 arch/arm64/kernel/mpam_mon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/mpam_mon.c b/arch/arm64/kernel/mpam_mon.c
index ae946b2ee681..0a3a202afc9f 100644
--- a/arch/arm64/kernel/mpam_mon.c
+++ b/arch/arm64/kernel/mpam_mon.c
@@ -64,6 +64,8 @@ int alloc_pmg(void)
 
 void free_pmg(u32 pmg)
 {
+	WARN_ON(!pmg);
+
 	pmg_free_map |= 1 << pmg;
 }
 
-- 
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