4.9 kernel panic in netlink unicast because audit replace passing audit sock as NULL

hi, Paul: we got one kernel panic on 4.9 kernel [16237.397896] [2018:10:09 23:06:55]audit: audit_pid=20802 reset [16238.098916] [2018:10:09 23:06:57]Unable to handle kernel NULL pointer dereference at virtual address 00000280 audit_sock is set to NULL in kauditd_send_skb, but later we are access it again in audit_replace caused this panic. is there patch for such SW issue on 4.9 kernel ? static int audit_replace(pid_t pid) { struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0, &pid, sizeof(pid)); if (!skb) return -ENOMEM; return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); } Br kassey