UPSTREAM: hid: bigben_probe(): validate report count
[ Upstream commit b94335f899542a0da5fafc38af8edcaf90195843 ]
bigben_probe() does not validate that the output report has the
needed report values in the first field.
A malicious device registering a report with one field and a single
value causes an head OOB write in bigben_worker() when
accessing report_field->value[1] to report_field->value[7].
Use hid_validate_values() which takes care of all the needed checks.
Bug: 268589017
Fixes: 256a90ed9e46 ("HID: hid-bigbenff: driver for BigBen Interactive PS3OFMINIPAD gamepad")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Link: https://lore.kernel.org/r/20230211-bigben-oob-v1-1-d2849688594c@diag.uniroma1.it
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I575c5d4c8a63a2065752a45c47b23cf725cc57ae
diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c
index 7bd40cb..8a6298a 100644
--- a/drivers/hid/hid-bigbenff.c
+++ b/drivers/hid/hid-bigbenff.c
@@ -371,7 +371,6 @@
{
struct bigben_device *bigben;
struct hid_input *hidinput;
- struct list_head *report_list;
struct led_classdev *led;
char *name;
size_t name_sz;
@@ -396,9 +395,12 @@
return error;
}
- report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
- bigben->report = list_entry(report_list->next,
- struct hid_report, list);
+ bigben->report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 8);
+ if (!bigben->report) {
+ hid_err(hid, "no output report 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);
