HID: check empty report_list in bigben_probe()

Add a check for empty report_list in bigben_probe().
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: 256a90ed9e46 ("HID: hid-bigbenff: driver for BigBen Interactive PS3OFMINIPAD gamepad")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c
index e8c5e3a..e8b1666 100644 (file)
--- a/drivers/hid/hid-bigbenff.c
+++ b/drivers/hid/hid-bigbenff.c
@@ -344,6 +344,11 @@ static int bigben_probe(struct hid_device *hid,
        }
 
        report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
+       if (list_empty(report_list)) {
+               hid_err(hid, "no output report found\n");
+               error = -ENODEV;
+               goto error_hw_stop;
+       }
        bigben->report = list_entry(report_list->next,
                struct hid_report, list);