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IPoIB: Fix skb leak when freeing neighbour 

ipoib_neigh_free() is sometimes called while neighbour is still alive,
so it might still have queued skbs.  Fix skb leak in this case.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Michael S. Tsirkin 2006-11-16 14:16:47 +02:00 коммит произвёл Roland Dreier
Родитель d2fcea7d68
Коммит 2745b5b713
3 изменённых файлов: 15 добавлений и 8 удалений
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2
drivers/infiniband/ulp/ipoib/ipoib.h
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@ -233,7 +233,7 @@ static inline struct ipoib_neigh **to_ipoib_neigh(struct neighbour *neigh)
} }
struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh); struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh);
void ipoib_neigh_free(struct ipoib_neigh *neigh); void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh);
extern struct workqueue_struct *ipoib_workqueue; extern struct workqueue_struct *ipoib_workqueue;

19
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -264,7 +264,7 @@ static void path_free(struct net_device *dev, struct ipoib_path *path)
if (neigh->ah) if (neigh->ah)
ipoib_put_ah(neigh->ah); ipoib_put_ah(neigh->ah);
ipoib_neigh_free(neigh); ipoib_neigh_free(dev, neigh);
} }
spin_unlock_irqrestore(&priv->lock, flags); spin_unlock_irqrestore(&priv->lock, flags);
@ -525,10 +525,11 @@ static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha)); ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
} else { } else {
neigh->ah = NULL; neigh->ah = NULL;
__skb_queue_tail(&neigh->queue, skb);
if (!path->query && path_rec_start(dev, path)) if (!path->query && path_rec_start(dev, path))
goto err_list; goto err_list;
__skb_queue_tail(&neigh->queue, skb);
} }
spin_unlock(&priv->lock); spin_unlock(&priv->lock);
@ -538,7 +539,7 @@ err_list:
list_del(&neigh->list); list_del(&neigh->list);
err_path: err_path:
ipoib_neigh_free(neigh); ipoib_neigh_free(dev, neigh);
++priv->stats.tx_dropped; ++priv->stats.tx_dropped;
dev_kfree_skb_any(skb); dev_kfree_skb_any(skb);
@ -655,7 +656,7 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
*/ */
ipoib_put_ah(neigh->ah); ipoib_put_ah(neigh->ah);
list_del(&neigh->list); list_del(&neigh->list);
ipoib_neigh_free(neigh); ipoib_neigh_free(dev, neigh);
spin_unlock(&priv->lock); spin_unlock(&priv->lock);
ipoib_path_lookup(skb, dev); ipoib_path_lookup(skb, dev);
goto out; goto out;
@ -786,7 +787,7 @@ static void ipoib_neigh_destructor(struct neighbour *n)
if (neigh->ah) if (neigh->ah)
ah = neigh->ah; ah = neigh->ah;
list_del(&neigh->list); list_del(&neigh->list);
ipoib_neigh_free(neigh); ipoib_neigh_free(n->dev, neigh);
} }
spin_unlock_irqrestore(&priv->lock, flags); spin_unlock_irqrestore(&priv->lock, flags);
@ -809,9 +810,15 @@ struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
return neigh; return neigh;
} }
void ipoib_neigh_free(struct ipoib_neigh *neigh) void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
{ {
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
*to_ipoib_neigh(neigh->neighbour) = NULL; *to_ipoib_neigh(neigh->neighbour) = NULL;
while ((skb = __skb_dequeue(&neigh->queue))) {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
kfree(neigh); kfree(neigh);
} }

2
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
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@ -114,7 +114,7 @@ static void ipoib_mcast_free(struct ipoib_mcast *mcast)
*/ */
if (neigh->ah) if (neigh->ah)
ipoib_put_ah(neigh->ah); ipoib_put_ah(neigh->ah);
ipoib_neigh_free(neigh); ipoib_neigh_free(dev, neigh);
} }
spin_unlock_irqrestore(&priv->lock, flags); spin_unlock_irqrestore(&priv->lock, flags);