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Commit bb8b7237 authored by F.A.Sulaiman's avatar F.A.Sulaiman Committed by Greg Kroah-Hartman
Browse files

HID: betop: fix slab-out-of-bounds Write in betop_probe 



commit 1e4ce418b1cb1a810256b5fb3fd33d22d1325993 upstream.

Syzbot reported slab-out-of-bounds Write bug in hid-betopff driver.
The problem is the driver assumes the device must have an input report but
some malicious devices violate this assumption.

So this patch checks hid_device's input is non empty before it's been used.

Reported-by: default avatar <syzbot+07efed3bc5a1407bd742@syzkaller.appspotmail.com>
Signed-off-by: default avatarF.A. SULAIMAN <asha.16@itfac.mrt.ac.lk>
Reviewed-by: default avatarPavel Skripkin <paskripkin@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 710be7c4

drivers/hid/hid-betopff.c

+10 −3
Original line number Diff line number Diff line
@@ -59,15 +59,22 @@ static int betopff_init(struct hid_device *hid) 
{

	struct betopff_device *betopff;

	struct hid_report *report;

	struct hid_input *hidinput =

			list_first_entry(&hid->inputs, struct hid_input, list);

	struct hid_input *hidinput;

	struct list_head *report_list =

			&hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct input_dev *dev = hidinput->input;

	struct input_dev *dev;

	int field_count = 0;

	int error;

	int i, j;



	if (list_empty(&hid->inputs)) {

		hid_err(hid, "no inputs found\n");

		return -ENODEV;

	}



	hidinput = list_first_entry(&hid->inputs, struct hid_input, list);

	dev = hidinput->input;



	if (list_empty(report_list)) {

		hid_err(hid, "no output reports found\n");

		return -ENODEV;