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hid: bigben_probe(): validate report count 

[ Upstream commit b94335f899 ]

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.

Fixes: 256a90ed9e ("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>
This commit is contained in:
Pietro Borrello 2023-02-12 00:01:44 +00:00 committed by Greg Kroah-Hartman
parent f2bf592ebd
commit ac55ee431c
1 changed files with 2 additions and 5 deletions
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7
drivers/hid/hid-bigbenff.c
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@ -371,7 +371,6 @@ static int bigben_probe(struct hid_device *hid,
{ {
struct bigben_device *bigben; struct bigben_device *bigben;
struct hid_input *hidinput; struct hid_input *hidinput;
struct list_head *report_list;
struct led_classdev *led; struct led_classdev *led;
char *name; char *name;
size_t name_sz; size_t name_sz;
@ -396,14 +395,12 @@ static int bigben_probe(struct hid_device *hid,
return error; return error;
} }
report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; bigben->report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 8);
if (list_empty(report_list)) { if (!bigben->report) {
hid_err(hid, "no output report found\n"); hid_err(hid, "no output report found\n");
error = -ENODEV; error = -ENODEV;
goto error_hw_stop; goto error_hw_stop;
} }
bigben->report = list_entry(report_list->next,
struct hid_report, list);
if (list_empty(&hid->inputs)) { if (list_empty(&hid->inputs)) {
hid_err(hid, "no inputs found\n"); hid_err(hid, "no inputs found\n");