linux-kernel - [PATCH linux-next] staging: r8188eu: use strscpy() to instead of strncpy()

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Date:   Mon, 26 Dec 2022 19:05:47 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <larry.finger@...inger.net>
Cc:     <phil@...lpotter.co.uk>, <paskripkin@...il.com>,
        <martin@...ser.cx>, <abdun.nihaal@...il.com>,
        <straube.linux@...il.com>, <sandsch@...thvilleschools.net>,
        <error27@...il.com>, <linux-staging@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>, <xu.panda@....com.cn>,
        <yang.yang29@....com.cn>
Subject: [PATCH linux-next] staging: r8188eu: 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/staging/r8188eu/os_dep/ioctl_linux.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 8e9b7b0664bc..e0a819970546 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -3061,8 +3061,7 @@ static int rtw_rereg_nd_name(struct net_device *dev,
 		char *reg_ifname;
 		reg_ifname = padapter->registrypriv.if2name;

-		strncpy(rereg_priv->old_ifname, reg_ifname, IFNAMSIZ);
-		rereg_priv->old_ifname[IFNAMSIZ - 1] = 0;
+		strscpy(rereg_priv->old_ifname, reg_ifname, IFNAMSIZ);
 	}

 	if (wrqu->data.length > IFNAMSIZ)
@@ -3084,8 +3083,7 @@ static int rtw_rereg_nd_name(struct net_device *dev,
 		rtw_ips_mode_req(&padapter->pwrctrlpriv, rereg_priv->old_ips_mode);
 	}

-	strncpy(rereg_priv->old_ifname, new_ifname, IFNAMSIZ);
-	rereg_priv->old_ifname[IFNAMSIZ - 1] = 0;
+	strscpy(rereg_priv->old_ifname, new_ifname, IFNAMSIZ);

 	if (!memcmp(new_ifname, "disable%d", 9)) {
 		/*  free network queue for Android's timming issue */
-- 
2.15.2