amt: use READ_ONCE() in amt module

There are some data races in the amt module.
amt->ready4, amt->ready6, and amt->status can be accessed concurrently
without locks.
So, it uses READ_ONCE() and WRITE_ONCE().

Fixes: cbc21dc1cfe9 ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/amt.c b/drivers/net/amt.c
index 1f41ba5..4c5c74d 100644 (file)
--- a/drivers/net/amt.c
+++ b/drivers/net/amt.c
@@ -584,7 +584,7 @@ static void amt_update_gw_status(struct amt_dev *amt, enum amt_status status,
                return;
        netdev_dbg(amt->dev, "Update GW status %s -> %s",
                   status_str[amt->status], status_str[status]);
-       amt->status = status;
+       WRITE_ONCE(amt->status, status);
 }
 
 static void __amt_update_relay_status(struct amt_tunnel_list *tunnel,
@@ -958,8 +958,8 @@ static void amt_event_send_request(struct amt_dev *amt)
        if (amt->req_cnt > AMT_MAX_REQ_COUNT) {
                netdev_dbg(amt->dev, "Gateway is not ready");
                amt->qi = AMT_INIT_REQ_TIMEOUT;
-               amt->ready4 = false;
-               amt->ready6 = false;
+               WRITE_ONCE(amt->ready4, false);
+               WRITE_ONCE(amt->ready6, false);
                amt->remote_ip = 0;
                amt_update_gw_status(amt, AMT_STATUS_INIT, false);
                amt->req_cnt = 0;
@@ -1239,7 +1239,8 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev)
                /* Gateway only passes IGMP/MLD packets */
                if (!report)
                        goto free;
-               if ((!v6 && !amt->ready4) || (v6 && !amt->ready6))
+               if ((!v6 && !READ_ONCE(amt->ready4)) ||
+                   (v6 && !READ_ONCE(amt->ready6)))
                        goto free;
                if (amt_send_membership_update(amt, skb,  v6))
                        goto free;
@@ -2368,7 +2369,7 @@ static bool amt_membership_query_handler(struct amt_dev *amt,
                ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
                skb_reset_transport_header(skb);
                skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
-               amt->ready4 = true;
+               WRITE_ONCE(amt->ready4, true);
                amt->mac = amtmq->response_mac;
                amt->req_cnt = 0;
                amt->qi = ihv3->qqic;
@@ -2391,7 +2392,7 @@ static bool amt_membership_query_handler(struct amt_dev *amt,
                mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
                skb_reset_transport_header(skb);
                skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
-               amt->ready6 = true;
+               WRITE_ONCE(amt->ready6, true);
                amt->mac = amtmq->response_mac;
                amt->req_cnt = 0;
                amt->qi = mld2q->mld2q_qqic;
@@ -2898,7 +2899,7 @@ static int amt_err_lookup(struct sock *sk, struct sk_buff *skb)
                break;
        case AMT_MSG_REQUEST:
        case AMT_MSG_MEMBERSHIP_UPDATE:
-               if (amt->status >= AMT_STATUS_RECEIVED_ADVERTISEMENT)
+               if (READ_ONCE(amt->status) >= AMT_STATUS_RECEIVED_ADVERTISEMENT)
                        mod_delayed_work(amt_wq, &amt->req_wq, 0);
                break;
        default: