[PATCH 3.2 010/101] USB: serial: ftdi_sio: fix modem-status error handling

[Ben Hutchings]

3.2.89-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@xxxxxxxxxx>

commit 427c3a95e3e29e65f59d99aaf320d7506f3eed57 upstream.

Make sure to detect short responses when fetching the modem status in
order to avoid parsing uninitialised buffer data and having bits of it
leak to user space.

Note that we still allow for short 1-byte responses.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2542,8 +2542,13 @@ static int ftdi_tiocmget(struct tty_stru
 			FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
 			0, priv->interface,
 			buf, len, WDR_TIMEOUT);
-	if (ret < 0)
+
+	/* NOTE: We allow short responses and handle that below. */
+	if (ret < 1) {
+		if (ret >= 0)
+			ret = -EIO;
 		goto out;
+	}
 
 	ret = (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
 		(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |