netdev - [PATCH net 5/6] can: etas_es58x: fix potential NULL pointer dereference on udev->serial

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Message-ID: <20250208115120.237274-6-mkl@pengutronix.de>
Date: Sat,  8 Feb 2025 12:45:18 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	yan kang <kangyan91@...look.com>,
	yue sun <samsun1006219@...il.com>,
	stable@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 5/6] can: etas_es58x: fix potential NULL pointer dereference on udev->serial

From: Vincent Mailhol <mailhol.vincent@...adoo.fr>

The driver assumed that es58x_dev->udev->serial could never be NULL.
While this is true on commercially available devices, an attacker
could spoof the device identity providing a NULL USB serial number.
That would trigger a NULL pointer dereference.

Add a check on es58x_dev->udev->serial before accessing it.

Reported-by: yan kang <kangyan91@...look.com>
Reported-by: yue sun <samsun1006219@...il.com>
Closes: https://lore.kernel.org/linux-can/SY8P300MB0421E0013C0EBD2AA46BA709A1F42@SY8P300MB0421.AUSP300.PROD.OUTLOOK.COM/
Fixes: 9f06631c3f1f ("can: etas_es58x: export product information through devlink_ops::info_get()")
Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Link: https://patch.msgid.link/20250204154859.9797-2-mailhol.vincent@wanadoo.fr
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/etas_es58x/es58x_devlink.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/etas_es58x/es58x_devlink.c b/drivers/net/can/usb/etas_es58x/es58x_devlink.c
index eee20839d96f..0d155eb1b9e9 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_devlink.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_devlink.c
@@ -248,7 +248,11 @@ static int es58x_devlink_info_get(struct devlink *devlink,
 			return ret;
 	}
 
-	return devlink_info_serial_number_put(req, es58x_dev->udev->serial);
+	if (es58x_dev->udev->serial)
+		ret = devlink_info_serial_number_put(req,
+						     es58x_dev->udev->serial);
+
+	return ret;
 }
 
 const struct devlink_ops es58x_dl_ops = {
-- 
2.47.2