From d0559a2f294c9b50d7795a8362931f0db8953de1 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Wed, 8 Mar 2017 16:03:00 +0000 Subject: [PATCH] USB: serial: ftdi_sio: only allow valid event_char values The "event_char" device attribute value, when written, is interpreted as an enable bit in bit 8, and an "event character" in bits 7 to 0. Return an error -EINVAL for out-of-range values. Use kstrtouint() to parse the integer instead of the obsolete simple_strtoul(). Signed-off-by: Ian Abbott Signed-off-by: Johan Hovold --- drivers/usb/serial/ftdi_sio.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index b774f9d32d4f..4032a675643c 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1738,9 +1738,12 @@ static ssize_t store_event_char(struct device *dev, struct usb_serial_port *port = to_usb_serial_port(dev); struct ftdi_private *priv = usb_get_serial_port_data(port); struct usb_device *udev = port->serial->dev; - int v = simple_strtoul(valbuf, NULL, 10); + unsigned int v; int rv; + if (kstrtouint(valbuf, 10, &v) || v >= 0x200) + return -EINVAL; + dev_dbg(&port->dev, "%s: setting event char = %i\n", __func__, v); rv = usb_control_msg(udev, -- 2.20.1