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HID: bigben: fix slab-out-of-bounds Write in bigben_probe

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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 <syzkaller@googlegroups.com>
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Dongliang Mu 2022-05-06 15:24:25 +08:00 committed by Jiri Kosina
parent 1af20714fe
commit fc4ef9d572
1 changed files with 6 additions and 0 deletions
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6
drivers/hid/hid-bigbenff.c
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@ -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);