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From ef14a4bf0910d06c7e202552914028d4956809cb Mon Sep 17 00:00:00 2001
From: Andrew Duggan <aduggan@synaptics.com>
Date: Tue, 17 Oct 2017 18:37:36 -0700
Subject: [PATCH] HID: rmi: Check that a device is a RMI device before calling
 RMI functions

The hid-rmi driver may handle non rmi devices on composite USB devices.
Callbacks need to make sure that the current device is a RMI device before
calling RMI specific functions. Most callbacks already have this check, but
this patch adds checks to the remaining callbacks.

Reported-by: Hendrik Langer <hendrik.langer@gmx.de>
Tested-by: Hendrik Langer <hendrik.langer@gmx.de>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/hid-rmi.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index ef241d66562e..0f43c4292685 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -368,6 +368,11 @@ static int rmi_check_sanity(struct hid_device *hdev, u8 *data, int size)
 static int rmi_raw_event(struct hid_device *hdev,
 		struct hid_report *report, u8 *data, int size)
 {
+	struct rmi_data *hdata = hid_get_drvdata(hdev);
+
+	if (!(hdata->device_flags & RMI_DEVICE))
+		return 0;
+
 	size = rmi_check_sanity(hdev, data, size);
 	if (size < 2)
 		return 0;
@@ -713,9 +718,11 @@ static void rmi_remove(struct hid_device *hdev)
 {
 	struct rmi_data *hdata = hid_get_drvdata(hdev);
 
-	clear_bit(RMI_STARTED, &hdata->flags);
-	cancel_work_sync(&hdata->reset_work);
-	rmi_unregister_transport_device(&hdata->xport);
+	if (hdata->device_flags & RMI_DEVICE) {
+		clear_bit(RMI_STARTED, &hdata->flags);
+		cancel_work_sync(&hdata->reset_work);
+		rmi_unregister_transport_device(&hdata->xport);
+	}
 
 	hid_hw_stop(hdev);
 }
-- 
2.14.3