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USB: serial: quatech2: fix control-message error handling

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commit 8c34cb8ddfe808d557b51da983ff10c02793beb2 upstream.

Make sure to detect short control-message transfers when fetching
modem and line state in open and when retrieving registers.

This specifically makes sure that an errno is returned to user space on
errors in TIOCMGET instead of a zero bitmask.

Also drop the unused getdevice function which also lacked appropriate
error handling.

Fixes: f7a33e608d9a ("USB: serial: add quatech2 usb to serial driver")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-01-12 14:56:20 +01:00 committed by Greg Kroah-Hartman
parent 594c9b4b0a
commit e17c48c328
1 changed files with 13 additions and 11 deletions
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24
drivers/usb/serial/quatech2.c
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@ -188,22 +188,22 @@ static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
}
static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_DEVICE, 0xc0, 0, 0,
data, 3, QT2_USB_TIMEOUT);
}
static inline int qt2_getregister(struct usb_device *dev,
u8 uart,
u8 reg,
u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0xc0, reg,
uart, data, sizeof(*data), QT2_USB_TIMEOUT);
int ret;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0xc0, reg,
uart, data, sizeof(*data), QT2_USB_TIMEOUT);
if (ret < sizeof(*data)) {
if (ret >= 0)
ret = -EIO;
}
return ret;
}
static inline int qt2_setregister(struct usb_device *dev,
@ -372,9 +372,11 @@ static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
0xc0, 0,
device_port, data, 2, QT2_USB_TIMEOUT);
if (status < 0) {
if (status < 2) {
dev_err(&port->dev, "%s - open port failed %i\n", __func__,
status);
if (status >= 0)
status = -EIO;
kfree(data);
return status;
}