linux-kernel - [PATCH] USB: serial: opticon: fix control-message timeouts

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Message-Id: <20200113172213.30869-1-johan@kernel.org>
Date:   Mon, 13 Jan 2020 18:22:13 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable <stable@...r.kernel.org>,
        Martin Jansen <martin.jansen@...icon.com>
Subject: [PATCH] USB: serial: opticon: fix control-message timeouts

The driver was issuing synchronous uninterruptible control requests
without using a timeout. This could lead to the driver hanging
on open() or tiocmset() due to a malfunctioning (or malicious) device
until the device is physically disconnected.

The USB upper limit of five seconds per request should be more than
enough.

Fixes: 309a057932ab ("USB: opticon: add rts and cts support")
Cc: stable <stable@...r.kernel.org>     # 2.6.39
Cc: Martin Jansen <martin.jansen@...icon.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---

This was reported to me off-list to be an issue with some opticon
devices. Let's address the obvious bug while waiting for a bug report
to be sent to the list.

Johan


 drivers/usb/serial/opticon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index cb7aac9cd9e7..ed2b4e6dca38 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -113,7 +113,7 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
 	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 				requesttype,
 				USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
-				0, 0, buffer, 1, 0);
+				0, 0, buffer, 1, USB_CTRL_SET_TIMEOUT);
 	kfree(buffer);
 
 	if (retval < 0)
-- 
2.24.1