can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv

It will trigger UAF for rx_kref of j1939_priv as following.

        cpu0                                    cpu1
j1939_sk_bind(socket0, ndev0, ...)
j1939_netdev_start
                                        j1939_sk_bind(socket1, ndev0, ...)
                                        j1939_netdev_start
j1939_priv_set
                                        j1939_priv_get_by_ndev_locked
j1939_jsk_add
.....
j1939_netdev_stop
kref_put_lock(&priv->rx_kref, ...)
                                        kref_get(&priv->rx_kref, ...)
                                        REFCOUNT_WARN("addition on 0;...")

====================================================
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0
RIP: 0010:refcount_warn_saturate+0x169/0x1e0
Call Trace:
 j1939_netdev_start+0x68b/0x920
 j1939_sk_bind+0x426/0xeb0
 ? security_socket_bind+0x83/0xb0

The rx_kref's kref_get() and kref_put() should use j1939_netdev_lock to
protect.

Fixes: 9d71dd0c70099 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/20210926104757.2021540-1-william.xuanziyang@huawei.com
Cc: stable@vger.kernel.org
Reported-by: syzbot+85d9878b19c94f9019ad@syzkaller.appspotmail.com
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 08c8606..9bc55ec 100644 (file)
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -249,11 +249,14 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
        struct j1939_priv *priv, *priv_new;
        int ret;
 
-       priv = j1939_priv_get_by_ndev(ndev);
+       spin_lock(&j1939_netdev_lock);
+       priv = j1939_priv_get_by_ndev_locked(ndev);
        if (priv) {
                kref_get(&priv->rx_kref);
+               spin_unlock(&j1939_netdev_lock);
                return priv;
        }
+       spin_unlock(&j1939_netdev_lock);
 
        priv = j1939_priv_create(ndev);
        if (!priv)
@@ -269,10 +272,10 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
                /* Someone was faster than us, use their priv and roll
                 * back our's.
                 */
+               kref_get(&priv_new->rx_kref);
                spin_unlock(&j1939_netdev_lock);
                dev_put(ndev);
                kfree(priv);
-               kref_get(&priv_new->rx_kref);
                return priv_new;
        }
        j1939_priv_set(ndev, priv);