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HID: hid-uclogic-params: Invalid parameter check in uclogic_params_huion_init

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[ Upstream commit ff6b548afe4d9d1ff3a0f6ef79e8cbca25d8f905 ]

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

Initialize the stack variables after checking the input parameters to
avoid a possible NULL pointer dereference.

Fixes: 9614219e93 ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443804 ("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>
This commit is contained in:
José Expósito 2022-01-05 18:29:14 +01:00 • committed by Greg Kroah-Hartman
commit f6fbc6a050
1 changed files with 7 additions and 3 deletions
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10
drivers/hid/hid-uclogic-params.c
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@ -707,9 +707,9 @@ static int uclogic_params_huion_init(struct uclogic_params *params,
struct hid_device *hdev)
{
int rc;
struct usb_device *udev = hid_to_usb_dev(hdev);
struct usb_interface *iface = to_usb_interface(hdev->dev.parent);
__u8 bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
struct usb_device *udev;
struct usb_interface *iface;
__u8 bInterfaceNumber;
bool found;
/* The resulting parameters (noop) */
struct uclogic_params p = {0, };
@ -723,6 +723,10 @@ static int uclogic_params_huion_init(struct uclogic_params *params,
goto cleanup;
}
udev = hid_to_usb_dev(hdev);
iface = to_usb_interface(hdev->dev.parent);
bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
/* If it's not a pen interface */
if (bInterfaceNumber != 0) {
/* TODO: Consider marking the interface invalid */