From 7838d5fd372942a190963796d9bcb4f72d6d68a7 Mon Sep 17 00:00:00 2001
From: Jingxian He <hejingxian@huawei.com>
Date: Tue, 22 Feb 2022 22:12:39 +0800
Subject: [PATCH] mm/pin_mem: add invalid check for pinmemory boot parameter

euleros inclusion
category: feature
bugzilla:https://gitee.com/openeuler/kernel/issues/I4UCEQ
CVE: NA

------------
When the pinmemory setting string is null, return directly
without setting pinmemory addr.

Signed-off-by: Jingxian He <hejingxian@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
---
 mm/pin_mem.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/pin_mem.c b/mm/pin_mem.c
index 34fe373c5fcc..d37938bcdc97 100644
--- a/mm/pin_mem.c
+++ b/mm/pin_mem.c
@@ -1092,9 +1092,12 @@ static int __init parse_pin_memory(char *cmdline)
 {
 	char *cur = cmdline;
 
+	if (!cmdline)
+		return 0;
+
 	pin_mem_len = memparse(cmdline, &cur);
 	if (cmdline == cur) {
-		pr_warn("crashkernel: memory value expected\n");
+		pr_warn("pinmem: memory value expected\n");
 		return -EINVAL;
 	}
 
-- 
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