HID: hid-uclogic-params: Invalid parameter check in uclogic_params_frame_init_v1_butt...

[ Upstream commit aa320fdbbbb482c19100f51461bd0069753ce3d7 ]

The function performs a check on the hdev input parameters, however, it
is used before the check.

Initialize the udev variable after the sanity check to avoid a
possible NULL pointer dereference.

Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443763 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 4136837..3e70f96 100644 (file)
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -452,7 +452,7 @@ static int uclogic_params_frame_init_v1_buttonpad(
 {
        int rc;
        bool found = false;
-       struct usb_device *usb_dev = hid_to_usb_dev(hdev);
+       struct usb_device *usb_dev;
        char *str_buf = NULL;
        const size_t str_len = 16;
 
@@ -462,6 +462,8 @@ static int uclogic_params_frame_init_v1_buttonpad(
                goto cleanup;
        }
 
+       usb_dev = hid_to_usb_dev(hdev);
+
        /*
         * Enable generic button mode
         */