Patch "USB: serial: ark3116: fix open error handling" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    USB: serial: ark3116: fix open error handling

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-serial-ark3116-fix-open-error-handling.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b631433b175f1002a31020e09bbfc2e5caecf290 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Thu, 12 Jan 2017 14:56:10 +0100
Subject: USB: serial: ark3116: fix open error handling

From: Johan Hovold <johan@kernel.org>

commit b631433b175f1002a31020e09bbfc2e5caecf290 upstream.

Fix open error handling which failed to detect errors when reading the
MSR and LSR registers, something which could lead to the shadow
registers being initialised from errnos.

Note that calling the generic close implementation is sufficient in the
error paths as the interrupt urb has not yet been submitted and the
register updates have not been made.

Fixes: f4c1e8d597d1 ("USB: ark3116: Make existing functions 16450-aware
and add close and release functions.")
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>

---
 drivers/usb/serial/ark3116.c |   25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -373,23 +373,29 @@ static int ark3116_open(struct tty_struc
 		dev_dbg(&port->dev,
 			"%s - usb_serial_generic_open failed: %d\n",
 			__func__, result);
-		goto err_out;
+		goto err_free;
 	}
 
 	/* remove any data still left: also clears error state */
 	ark3116_read_reg(serial, UART_RX, buf);
 
 	/* read modem status */
-	priv->msr = ark3116_read_reg(serial, UART_MSR, buf);
+	result = ark3116_read_reg(serial, UART_MSR, buf);
+	if (result < 0)
+		goto err_close;
+	priv->msr = *buf;
+
 	/* read line status */
-	priv->lsr = ark3116_read_reg(serial, UART_LSR, buf);
+	result = ark3116_read_reg(serial, UART_LSR, buf);
+	if (result < 0)
+		goto err_close;
+	priv->lsr = *buf;
 
 	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 	if (result) {
 		dev_err(&port->dev, "submit irq_in urb failed %d\n",
 			result);
-		ark3116_close(port);
-		goto err_out;
+		goto err_close;
 	}
 
 	/* activate interrupts */
@@ -402,8 +408,15 @@ static int ark3116_open(struct tty_struc
 	if (tty)
 		ark3116_set_termios(tty, port, NULL);
 
-err_out:
 	kfree(buf);
+
+	return 0;
+
+err_close:
+	usb_serial_generic_close(port);
+err_free:
+	kfree(buf);
+
 	return result;
 }
 


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.4/usb-serial-mct_u232-fix-modem-status-error-handling.patch
queue-4.4/usb-serial-ark3116-fix-open-error-handling.patch
queue-4.4/usb-serial-io_edgeport-fix-epic-descriptor-handling.patch
queue-4.4/usb-serial-ti_usb_3410_5052-fix-control-message-error-handling.patch
queue-4.4/usb-serial-keyspan_pda-fix-receive-sanity-checks.patch
queue-4.4/usb-serial-sierra-fix-bogus-alternate-setting-assumption.patch
queue-4.4/usb-serial-ssu100-fix-control-message-error-handling.patch
queue-4.4/usb-serial-digi_acceleport-fix-incomplete-rx-sanity-check.patch
queue-4.4/usb-serial-io_edgeport-fix-descriptor-error-handling.patch
queue-4.4/usb-serial-quatech2-fix-control-message-error-handling.patch
queue-4.4/usb-serial-ftdi_sio-fix-latency-timer-error-handling.patch