[PATCH 2/7] HID: roccat: koneplus: reject short button reports

The raw event callback runs before HID core validates and zero-pads the
report.  It passes the buffer to helpers which inspect data[0] and, for a
button report, read the complete struct koneplus_mouse_report_button.  A
truncated report can therefore cause an out-of-bounds read.

Require enough data for the button report before calling either helper.
Commit 47669bec44fe ("HID: asus: refactor the two workqueues and init
sequence") added the same kind of raw-event length validation to hid-asus.

Fixes: 47dbdbffe15b ("HID: roccat: Add support for Roccat Kone[+] v2")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <redacted>
---
 drivers/hid/hid-roccat-koneplus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index f80a60539a96..df39868d7e6a 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c

@@ -523,6 +523,9 @@ static int koneplus_raw_event(struct hid_device *hdev,
 	if (koneplus == NULL)
 		return 0;
 
+	if (size < sizeof(struct koneplus_mouse_report_button))
+		return 0;
+
 	koneplus_keep_values_up_to_date(koneplus, data);
 
 	if (koneplus->roccat_claimed)

-- 
2.34.1