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net: orphan frags on receive

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zero copy packets are normally sent to the outside
network, but bridging, tun etc might loop them
back to host networking stack. If this happens
destructors will never be called, so orphan
the frags immediately on receive.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2012-07-20 09:23:17 +00:00 committed by David S. Miller
parent 868eefeb17
commit 1080e512d4
1 changed files with 6 additions and 1 deletions
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7
net/core/dev.c
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@ -1632,6 +1632,8 @@ static inline int deliver_skb(struct sk_buff *skb,
struct packet_type *pt_prev,
struct net_device *orig_dev)
{
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
return -ENOMEM;
atomic_inc(&skb->users);
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}
@ -3262,7 +3264,10 @@ static int __netif_receive_skb(struct sk_buff *skb)
}
if (pt_prev) {
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
ret = -ENOMEM;
else
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
} else {
atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);