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>

1 files 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);
 }