Re: [syzbot] [can?] WARNING: refcount bug in j1939_session_put

[Edward Adam Davis]

get ref to skb

#syz test: net-next 743ff02152bc

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 7e8a20f2fc42..31ccbe9a276d 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -51,6 +51,7 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
 	if (!skb)
 		return;
 
+	skb_get(skb);
 	j1939_priv_get(priv);
 	can_skb_set_owner(skb, iskb->sk);