linux-kernel - [PATCH 4.19 070/120] Goodix Fingerprint device is not a modem

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Message-Id: <20210315135722.267621306@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:57:01 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yorick de Wid <ydewid@...il.com>
Subject: [PATCH 4.19 070/120] Goodix Fingerprint device is not a modem

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Yorick de Wid <ydewid@...il.com>

commit 4d8654e81db7346f915eca9f1aff18f385cab621 upstream.

The CDC ACM driver is false matching the Goodix Fingerprint device
against the USB_CDC_ACM_PROTO_AT_V25TER.

The Goodix Fingerprint device is a biometrics sensor that should be
handled in user-space. libfprint has some support for Goodix
fingerprint sensors, although not for this particular one. It is
possible that the vendor allocates a PID per OEM (Lenovo, Dell etc).
If this happens to be the case then more devices from the same vendor
could potentially match the ACM modem module table.

Signed-off-by: Yorick de Wid <ydewid@...il.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210213144901.53199-1-ydewid@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/class/cdc-acm.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1973,6 +1973,11 @@ static const struct usb_device_id acm_id
 	.driver_info = SEND_ZERO_PACKET,
 	},
 
+	/* Exclude Goodix Fingerprint Reader */
+	{ USB_DEVICE(0x27c6, 0x5395),
+	.driver_info = IGNORE_DEVICE,
+	},
+
 	/* control interfaces without any protocol set */
 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
 		USB_CDC_PROTO_NONE) },