HID: core: fix validation of report id 0

commit 1b15d2e5b8077670b1e6a33250a0d9577efff4a5 upstream.

Some drivers use the first HID report in the list instead of using an
index. In these cases, validation uses ID 0, which was supposed to mean
"first known report". This fixes the problem, which was causing at least
the lgff family of devices to stop working since hid_validate_values
was being called with ID 0, but the devices used single numbered IDs
for their reports:

0x05, 0x01,         /*  Usage Page (Desktop),                   */
0x09, 0x05,         /*  Usage (Gamepad),                        */
0xA1, 0x01,         /*  Collection (Application),               */
0xA1, 0x02,         /*      Collection (Logical),               */
0x85, 0x01,         /*          Report ID (1),                  */
...

Reported-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index c4e5cdfa5d247efc0f80dfce1e1ce89c9c8da45b..81d0e6e1f754101479d95dc5c756498fe3bbc720 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -796,7 +796,17 @@ struct hid_report *hid_validate_values(struct hid_device *hid,
         * ->numbered being checked, which may not always be the case when
         * drivers go to access report values.
         */
-       report = hid->report_enum[type].report_id_hash[id];
+       if (id == 0) {
+               /*
+                * Validating on id 0 means we should examine the first
+                * report in the list.
+                */
+               report = list_entry(
+                               hid->report_enum[type].report_list.next,
+                               struct hid_report, list);
+       } else {
+               report = hid->report_enum[type].report_id_hash[id];
+       }
        if (!report) {
                hid_err(hid, "missing %s %u\n", hid_report_names[type], id);
                return NULL;