linux-kernel - [PATCH 4.14 54/92] media: rc: oops in ir_timer

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Message-Id: <20180720121421.068446690@linuxfoundation.org>
Date:   Fri, 20 Jul 2018 14:13:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 54/92] media: rc: oops in ir_timer_keyup after device unplug

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Sean Young <sean@...s.org>

commit 8d4068810d9926250dd2435719a080b889eb44c3 upstream.

If there is IR in the raw kfifo when ir_raw_event_unregister() is called,
then kthread_stop() causes ir_raw_event_thread to be scheduled, decode
some scancodes and re-arm timer_keyup. The timer_keyup then fires when
the rc device is long gone.

Cc: stable@...r.kernel.org
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/rc/rc-main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1824,11 +1824,11 @@ void rc_unregister_device(struct rc_dev
 	if (!dev)
 		return;
 
-	del_timer_sync(&dev->timer_keyup);
-
 	if (dev->driver_type == RC_DRIVER_IR_RAW)
 		ir_raw_event_unregister(dev);
 
+	del_timer_sync(&dev->timer_keyup);
+
 	rc_free_rx_device(dev);
 
 	device_del(&dev->dev);