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HID: pidff: fix OOB write when hid->inputs is empty

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hid_pidff_init_with_quirks() derives its input_dev from

	list_entry(hid->inputs.next, struct hid_input, list)

without first checking that hid->inputs is non-empty.  The list member
of struct hid_input is at offset 0, so on an empty list list_entry()
yields &hid->inputs itself and the following hidinput->input load reads
an unrelated member of struct hid_device.  dev is then a type-confused
pointer, and force-feedback init writes through it: each
set_bit(FF_*, dev->ffbit) stores 8 bytes at dev + 192, past the end of
the object dev actually aliases, and input_ff_create() adds further
writes of a heap pointer and two function pointers.

Until hid-universal-pidff the only caller was hid_pidff_init() from
usbhid, which runs under HID_CLAIMED_INPUT and therefore always has at
least one hid_input.  universal_pidff_probe() starts the device with
HID_CONNECT_DEFAULT & ~HID_CONNECT_FF and then calls
hid_pidff_init_with_quirks() directly whenever the descriptor carries a
PID usage page, bypassing that gate.  A report descriptor whose only
application collection is on HID_UP_PID leaves hid->inputs empty while
hid_connect() still succeeds through the hidraw claim, so probe reaches
the unguarded list_entry().

The write happens in the USB probe path, on the hotplug workqueue, so
plugging in a malicious device is enough to trigger it; no attacker
software and no logged-in user are required.  KASAN reports an 8-byte
out-of-bounds write in hid_pidff_init_with_quirks() reached from
universal_pidff_probe().

Check for an empty list before deriving dev and return -ENODEV, as the
other HID force-feedback drivers already do.  universal_pidff_probe()
propagates the error and unwinds.

Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Fixes: f06bf8d94f ("HID: Add hid-universal-pidff driver and supported device ids")
Reported-by: Federico Kirschbaum <federico.kirschbaum@xbow.com>
Reported-by: Baul Lee <baul.lee@xbow.com>
Cc: stable@vger.kernel.org
Signed-off-by: Baul Lee <baul.lee@xbow.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Baul Lee
2026-07-26 15:25:03 +09:00
committed by Jiri Kosina
parent 456d506b60
commit 67bb1074e3
1 changed files with 10 additions and 3 deletions
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13
drivers/hid/usbhid/hid-pidff.c
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@@ -1539,13 +1539,20 @@ static int pidff_check_autocenter(struct pidff_device *pidff,
int hid_pidff_init_with_quirks(struct hid_device *hid, u32 initial_quirks)
{
struct pidff_device *pidff;
struct hid_input *hidinput =
list_entry(hid->inputs.next, struct hid_input, list);
struct input_dev *dev = hidinput->input;
struct hid_input *hidinput;
struct input_dev *dev;
struct ff_device *ff;
int max_effects;
int error;
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;
hid_dbg(hid, "starting pid init\n");
if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {