HID: fix oops in gyration_event()

Fix oops caused by dereferencing field->hidinput in cases where
the device hasn't been claimed by hid-input.

Reported-by: Andreas Demmer <mail@andreas-demmer.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-gyration.c b/drivers/hid/hid-gyration.c
index cab13e8..62416e6 100644 (file)
--- a/drivers/hid/hid-gyration.c
+++ b/drivers/hid/hid-gyration.c
@@ -53,10 +53,13 @@ static int gyration_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 static int gyration_event(struct hid_device *hdev, struct hid_field *field,
                struct hid_usage *usage, __s32 value)
 {
-       struct input_dev *input = field->hidinput->input;
+
+       if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
+               return 0;
 
        if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK &&
                        (usage->hid & 0xff) == 0x82) {
+               struct input_dev *input = field->hidinput->input;
                input_event(input, usage->type, usage->code, 1);
                input_sync(input);
                input_event(input, usage->type, usage->code, 0);