[PATCH] hid: asus: asus_report_fixup: fix potential read out of bounds

[Andrew Ballance]

#syz test

there may be a read out of the bounds of rdesc.
this adds bounds checks

Signed-off-by: Andrew Ballance <andrewjballance@xxxxxxxxx>
---
 drivers/hid/hid-asus.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 02de2bf4f790..37e6d25593c2 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -1204,8 +1204,8 @@ static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 	}
 
 	/* match many more n-key devices */
-	if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
-		for (int i = 0; i < *rsize + 1; i++) {
+	if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && *rsize > 15) {
+		for (int i = 0; i < *rsize - 15; i++) {
 			/* offset to the count from 0x5a report part always 14 */
 			if (rdesc[i] == 0x85 && rdesc[i + 1] == 0x5a &&
 			    rdesc[i + 14] == 0x95 && rdesc[i + 15] == 0x05) {
-- 
2.45.1