diff options
| -rw-r--r-- | net/core/dst.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/net/core/dst.c b/net/core/dst.c index 14b33baf073..d5e2c4c0910 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -171,7 +171,7 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev, dst_init_metrics(dst, dst_default_metrics, true); dst->expires = 0UL; dst->path = dst; - dst->_neighbour = NULL; + RCU_INIT_POINTER(dst->_neighbour, NULL); #ifdef CONFIG_XFRM dst->xfrm = NULL; #endif @@ -229,11 +229,11 @@ struct dst_entry *dst_destroy(struct dst_entry * dst) smp_rmb(); again: - neigh = dst->_neighbour; + neigh = rcu_dereference_protected(dst->_neighbour, 1); child = dst->child; if (neigh) { - dst->_neighbour = NULL; + RCU_INIT_POINTER(dst->_neighbour, NULL); neigh_release(neigh); } @@ -360,14 +360,19 @@ static void dst_ifdown(struct dst_entry *dst, struct net_device *dev, if (!unregister) { dst->input = dst->output = dst_discard; } else { + struct neighbour *neigh; + dst->dev = dev_net(dst->dev)->loopback_dev; dev_hold(dst->dev); dev_put(dev); - if (dst->_neighbour && dst->_neighbour->dev == dev) { - dst->_neighbour->dev = dst->dev; + rcu_read_lock(); + neigh = dst_get_neighbour(dst); + if (neigh && neigh->dev == dev) { + neigh->dev = dst->dev; dev_hold(dst->dev); dev_put(dev); } + rcu_read_unlock(); } } |