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HID: lenovo: Check hid_get_drvdata() returns non NULL in lenovo_event()

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The HID lenovo probe function only attaches drvdata to one of the
USB interfaces, but lenovo_event() will get called for all USB interfaces
to which hid-lenovo is bound.

This allows a malicious device to fake being a device handled by
hid-lenovo, which generates events for which lenovo_event() has
special handling (and thus dereferences hid_get_drvdata()) on another
interface triggering a NULL pointer exception.

Add a check for hid_get_drvdata() returning NULL, avoiding this
possible NULL pointer exception.

Fixes: bc04b37ea0 ("HID: lenovo: Add ThinkPad 10 Ultrabook Keyboard support")
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Hans de Goede 2021-04-04 10:04:26 +02:00 committed by Jiri Kosina
parent 658d04e6eb
commit 34348a8661
1 changed files with 3 additions and 0 deletions
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3
drivers/hid/hid-lenovo.c
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@ -508,6 +508,9 @@ static int lenovo_event_cptkbd(struct hid_device *hdev,
static int lenovo_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
if (!hid_get_drvdata(hdev))
return 0;
switch (hdev->product) {
case USB_DEVICE_ID_LENOVO_CUSBKBD:
case USB_DEVICE_ID_LENOVO_CBTKBD: