linux-kernel - [PATCH net-next v2] net/rds: use strscpy() to instead of strncpy()

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Message-ID: <202301111425483027624@zte.com.cn>
Date:   Wed, 11 Jan 2023 14:25:48 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <santosh.shilimkar@...cle.com>, <kuba@...nel.org>
Cc:     <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <rds-devel@....oracle.com>, <linux-kernel@...r.kernel.org>,
        <xu.panda@....com.cn>, <yang.yang29@....com.cn>
Subject: [PATCH net-next v2] net/rds: 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>
---
change for v2
 - Use the returns of strscpy to make the copy and the preceding 
BUG_ON() together.Thanks to Jakub Kicinski. 
---
 net/rds/stats.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/rds/stats.c b/net/rds/stats.c
index 9e87da43c004..7018c67418f5 100644
--- a/net/rds/stats.c
+++ b/net/rds/stats.c
@@ -88,9 +88,7 @@ void rds_stats_info_copy(struct rds_info_iterator *iter,
 	size_t i;

 	for (i = 0; i < nr; i++) {
-		BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
-		strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
-		ctr.name[sizeof(ctr.name) - 1] = '\0';
+		BUG_ON(strscpy(ctr.name, names[i], sizeof(ctr.name)) < 0);
 		ctr.value = values[i];

 		rds_info_copy(iter, &ctr, sizeof(ctr));
-- 
2.15.2