| Message ID | 20230114-hid-fix-emmpty-report-list-v1-1-e4d02fad3ba5@diag.uniroma1.it |
|---|---|
| State | Accepted |
| Commit | b12fece4c64857e5fab4290bf01b2e0317a88456 |
| Headers | show |
| Series | Cover Letter: HID: drop assumptions on non-empty report lists | expand |
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index bd47628da6be..3e1803592bd4 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -993,8 +993,8 @@ struct hid_report *hid_validate_values(struct hid_device *hid, * Validating on id 0 means we should examine the first * report in the list. */ - report = list_entry( - hid->report_enum[type].report_list.next, + report = list_first_entry_or_null( + &hid->report_enum[type].report_list, struct hid_report, list); } else { report = hid->report_enum[type].report_id_hash[id];
Add a check for empty report_list in hid_validate_values(). The missing check causes a type confusion when issuing a list_entry() on an empty report_list. The problem is caused by the assumption that the device must have valid report_list. While this will be true for all normal HID devices, a suitably malicious device can violate the assumption. Fixes: 1b15d2e5b807 ("HID: core: fix validation of report id 0") Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it> --- drivers/hid/hid-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)