Commit 2d5a9c72 authored by Johan Hovold's avatar Johan Hovold
Browse files

USB: serial: ch341: fix control-message error handling 



A short control transfer would currently fail to be detected, something
which could lead to stale buffer data being used as valid input.

Check for short transfers, and make sure to log any transfer errors.

Note that this also avoids leaking heap data to user space (TIOCMGET)
and the remote device (break control).

Fixes: 6ce76104 ("USB: Driver for CH341 USB-serial adaptor")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent 146cc8a1

drivers/usb/serial/ch341.c

+21 −11
Original line number Diff line number Diff line
@@ -113,6 +113,8 @@ static int ch341_control_out(struct usb_device *dev, u8 request, 
	r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,

			    USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,

			    value, index, NULL, 0, DEFAULT_TIMEOUT);

	if (r < 0)

		dev_err(&dev->dev, "failed to send control message: %d\n", r);



	return r;

}
@@ -130,9 +132,22 @@ static int ch341_control_in(struct usb_device *dev, 
	r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request,

			    USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,

			    value, index, buf, bufsize, DEFAULT_TIMEOUT);

	if (r < bufsize) {

		if (r >= 0) {

			dev_err(&dev->dev,

				"short control message received (%d < %u)\n",

				r, bufsize);

			r = -EIO;

		}



		dev_err(&dev->dev, "failed to receive control message: %d\n",

			r);

		return r;

	}



	return 0;

}



static int ch341_set_baudrate_lcr(struct usb_device *dev,

				  struct ch341_private *priv, u8 lcr)

{
@@ -181,9 +196,9 @@ static int ch341_set_handshake(struct usb_device *dev, u8 control) 


static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)

{

	const unsigned int size = 2;

	char *buffer;

	int r;

	const unsigned size = 8;

	unsigned long flags;



	buffer = kmalloc(size, GFP_KERNEL);
@@ -194,14 +209,9 @@ static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) 
	if (r < 0)

		goto out;



	/* setup the private status if available */

	if (r == 2) {

		r = 0;

	spin_lock_irqsave(&priv->lock, flags);

	priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT;

	spin_unlock_irqrestore(&priv->lock, flags);

	} else

		r = -EPROTO;



out:	kfree(buffer);

	return r;
@@ -211,9 +221,9 @@ out: kfree(buffer); 


static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)

{

	const unsigned int size = 2;

	char *buffer;

	int r;

	const unsigned size = 8;



	buffer = kmalloc(size, GFP_KERNEL);

	if (!buffer)

CRA Git | Maintained and supported by SUSTech CRA and CCSE