HID: steam: fixes race in handling device list.

Using uhid and KASAN this driver crashed because it was getting
several connection events where it only expected one. Then the
device was added several times to the static device list and it got
corrupted.

This patch checks if the device is already in the list before adding
it.

Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Tested-by: Siarhei Vishniakou <svv@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
index 6286204d4c56029656f6cf68758e75781d9ff0ff..a3b151b29bd711c2f87a6d4b6de8ac43b9219429 100644 (file)
--- a/drivers/hid/hid-steam.c
+++ b/drivers/hid/hid-steam.c
@@ -526,7 +526,8 @@ static int steam_register(struct steam_device *steam)
                        steam_battery_register(steam);
 
                mutex_lock(&steam_devices_lock);
-               list_add(&steam->list, &steam_devices);
+               if (list_empty(&steam->list))
+                       list_add(&steam->list, &steam_devices);
                mutex_unlock(&steam_devices_lock);
        }
 
@@ -552,7 +553,7 @@ static void steam_unregister(struct steam_device *steam)
                hid_info(steam->hdev, "Steam Controller '%s' disconnected",
                                steam->serial_no);
                mutex_lock(&steam_devices_lock);
-               list_del(&steam->list);
+               list_del_init(&steam->list);
                mutex_unlock(&steam_devices_lock);
                steam->serial_no[0] = 0;
        }
@@ -738,6 +739,7 @@ static int steam_probe(struct hid_device *hdev,
        mutex_init(&steam->mutex);
        steam->quirks = id->driver_data;
        INIT_WORK(&steam->work_connect, steam_work_connect_cb);
+       INIT_LIST_HEAD(&steam->list);
 
        steam->client_hdev = steam_create_client_hid(hdev);
        if (IS_ERR(steam->client_hdev)) {