can: j1939: warn if resources are still linked on destroy

j1939_session_destroy() and __j1939_priv_release() should be called only
if session, ecu or socket are not linked or used by any one else. If at
least one of these resources is linked, then the reference counting is
broken somewhere.

This warning will be triggered before KASAN will do, and will make it
easier to debug initial issue. This works on platforms without KASAN
support.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 2afcf27..137054b 100644 (file)
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -152,6 +152,10 @@ static void __j1939_priv_release(struct kref *kref)
 
        netdev_dbg(priv->ndev, "%s: 0x%p\n", __func__, priv);
 
+       WARN_ON_ONCE(!list_empty(&priv->active_session_list));
+       WARN_ON_ONCE(!list_empty(&priv->ecus));
+       WARN_ON_ONCE(!list_empty(&priv->j1939_socks));
+
        dev_put(ndev);
        kfree(priv);
 }

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 0c62b8f..9f99af5 100644 (file)
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -267,6 +267,9 @@ static void j1939_session_destroy(struct j1939_session *session)
 
        netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
 
+       WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
+       WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
+
        skb_queue_purge(&session->skb_queue);
        __j1939_session_drop(session);
        j1939_priv_put(session->priv);