From fc4ef9d5724973193bfa5ebed181dba6de3a56db Mon Sep 17 00:00:00 2001 From: Dongliang Mu Date: Fri, 6 May 2022 15:24:25 +0800 Subject: HID: bigben: fix slab-out-of-bounds Write in bigben_probe There is a slab-out-of-bounds Write bug in hid-bigbenff driver. The problem is the driver assumes the device must have an input but some malicious devices violate this assumption. Fix this by checking hid_device's input is non-empty before its usage. Reported-by: syzkaller Signed-off-by: Dongliang Mu Signed-off-by: Jiri Kosina --- drivers/hid/hid-bigbenff.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/hid') diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c index 74ad8bf98bfd..e8c5e3ac9fff 100644 --- a/drivers/hid/hid-bigbenff.c +++ b/drivers/hid/hid-bigbenff.c @@ -347,6 +347,12 @@ static int bigben_probe(struct hid_device *hid, bigben->report = list_entry(report_list->next, struct hid_report, list); + if (list_empty(&hid->inputs)) { + hid_err(hid, "no inputs found\n"); + error = -ENODEV; + goto error_hw_stop; + } + hidinput = list_first_entry(&hid->inputs, struct hid_input, list); set_bit(FF_RUMBLE, hidinput->input->ffbit); -- cgit v1.2.3