diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index b5ef3cb..b390002 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -430,11 +430,12 @@ static void __exit ulog_tg_exit(void)
 			pr_debug("timer was pending, deleting\n");
 			del_timer(&ub->timer);
 		}
-
+		spin_lock_bh(&ulog_lock);
 		if (ub->skb) {
 			kfree_skb(ub->skb);
 			ub->skb = NULL;
 		}
+		spin_unlock_bh(&ulog_lock);
 	}
 }