linux-kernel - [PATCH linux-next] mm/damon/sysfs-schemes: use strscpy() to instead of strncpy()

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Message-ID: <202301091946553770006@zte.com.cn>
Date:   Mon, 9 Jan 2023 19:46:55 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <sj@...nel.org>
Cc:     <akpm@...ux-foundation.org>, <damon@...ts.linux.dev>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <xu.panda@....com.cn>, <yang.yang29@....com.cn>
Subject: [PATCH linux-next] mm/damon/sysfs-schemes: use strscpy() to instead of strncpy()

From: Xu Panda <xu.panda@....com.cn>

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL-terminated strings.

Signed-off-by: Xu Panda <xu.panda@....com.cn>
Signed-off-by: Yang Yang <yang.yang29@....com.cn>
---
 mm/damon/sysfs-schemes.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index f0dabe3e2dc0..86edca66aab1 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -353,8 +353,7 @@ static ssize_t memcg_path_store(struct kobject *kobj,
 	if (!path)
 		return -ENOMEM;

-	strncpy(path, buf, count);
-	path[count] = '\0';
+	strscpy(path, buf, count + 1);
 	filter->memcg_path = path;
 	return count;
 }
-- 
2.15.2