The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2339536d229df25c71c0900fc619289229bfecf6 Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Thu, 12 Oct 2017 10:54:21 +0200 Subject: [PATCH] USB: serial: metro-usb: stop I/O after failed open
Make sure to kill the interrupt-in URB after a failed open request. Apart from saving power (and avoiding stale input after a later successful open), this also prevents a NULL-deref in the completion handler if the port is manually unbound.
Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Fixes: 704577861d5e ("USB: serial: metro-usb: get data from device in Uni-Directional mode.") Cc: stable stable@vger.kernel.org # 3.5 Signed-off-by: Johan Hovold johan@kernel.org
diff --git a/drivers/usb/serial/metro-usb.c b/drivers/usb/serial/metro-usb.c index cc84da8dbb84..4bb29e03dae4 100644 --- a/drivers/usb/serial/metro-usb.c +++ b/drivers/usb/serial/metro-usb.c @@ -188,7 +188,7 @@ static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port) dev_err(&port->dev, "%s - failed submitting interrupt in urb, error code=%d\n", __func__, result); - goto exit; + return result; }
/* Send activate cmd to device */ @@ -197,9 +197,14 @@ static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port) dev_err(&port->dev, "%s - failed to configure device, error code=%d\n", __func__, result); - goto exit; + goto err_kill_urb; } -exit: + + return 0; + +err_kill_urb: + usb_kill_urb(port->interrupt_in_urb); + return result; }