linux-kernel - [PATCH v2] staging/ks7010: Remove all strcpy() uses in favor of strscpy()

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Date:   Fri, 23 Jul 2021 16:51:22 +0200
From:   Len Baker <len.baker@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Len Baker <len.baker@....com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v2] staging/ks7010: Remove all strcpy() uses in favor of strscpy()

strcpy() performs no bounds checking on the destination buffer. This
could result in linear overflows beyond the end of the buffer, leading
to all kinds of misbehaviors. The safe replacement is strscpy().

Signed-off-by: Len Baker <len.baker@....com>
---
Changelog v1 -> v2
- Use the correct length for the extra pointer (Dan Carpenter).

 drivers/staging/ks7010/ks_wlan_net.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/ks7010/ks_wlan_net.c b/drivers/staging/ks7010/ks_wlan_net.c
index 09e7b4cd0138..631ad769c3d5 100644
--- a/drivers/staging/ks7010/ks_wlan_net.c
+++ b/drivers/staging/ks7010/ks_wlan_net.c
@@ -158,13 +158,13 @@ static int ks_wlan_get_name(struct net_device *dev,

 	/* for SLEEP MODE */
 	if (priv->dev_state < DEVICE_STATE_READY)
-		strcpy(cwrq->name, "NOT READY!");
+		strscpy(cwrq->name, "NOT READY!", sizeof(cwrq->name));
 	else if (priv->reg.phy_type == D_11B_ONLY_MODE)
-		strcpy(cwrq->name, "IEEE 802.11b");
+		strscpy(cwrq->name, "IEEE 802.11b", sizeof(cwrq->name));
 	else if (priv->reg.phy_type == D_11G_ONLY_MODE)
-		strcpy(cwrq->name, "IEEE 802.11g");
+		strscpy(cwrq->name, "IEEE 802.11g", sizeof(cwrq->name));
 	else
-		strcpy(cwrq->name, "IEEE 802.11b/g");
+		strscpy(cwrq->name, "IEEE 802.11b/g", sizeof(cwrq->name));

 	return 0;
 }
@@ -1808,8 +1808,8 @@ static int ks_wlan_get_firmware_version(struct net_device *dev,
 {
 	struct ks_wlan_private *priv = netdev_priv(dev);

-	strcpy(extra, priv->firmware_version);
 	dwrq->length = priv->version_size + 1;
+	strscpy(extra, priv->firmware_version, dwrq->length);
 	return 0;
 }

--
2.25.1