HID: check empty report_list in hid_validate_values()

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>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index bd47628..3e18035 100644 (file)
--- 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];