linux-kernel - [PATCH linux-next] can: ucan: use strscpy() to instead of strncpy()

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Date:   Wed, 7 Dec 2022 09:09:09 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <wg@...ndegger.com>
Cc:     <mkl@...gutronix.de>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>,
        <mailhol.vincent@...adoo.fr>, <stefan.maetje@....eu>,
        <socketcan@...tkopp.net>, <dzm91@...t.edu.cn>,
        <julia.lawall@...ia.fr>, <gustavoars@...nel.org>,
        <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <xu.panda@....com.cn>,
        <yang.yang29@....com.cn>
Subject: [PATCH linux-next] can: ucan: 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>
---
 drivers/net/can/usb/ucan.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index ffa38f533c35..159e25ffa337 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -1534,9 +1534,8 @@ static int ucan_probe(struct usb_interface *intf,
 				     sizeof(union ucan_ctl_payload));
 	if (ret > 0) {
 		/* copy string while ensuring zero termination */
-		strncpy(firmware_str, up->ctl_msg_buffer->raw,
-			sizeof(union ucan_ctl_payload));
-		firmware_str[sizeof(union ucan_ctl_payload)] = '\0';
+		strscpy(firmware_str, up->ctl_msg_buffer->raw,
+			sizeof(union ucan_ctl_payload) + 1);
 	} else {
 		strcpy(firmware_str, "unknown");
 	}
-- 
2.15.2