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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Michael S. Tsirkin authored and David S. Miller committed 2012-07-22 12:39:33 -07:00
1 parent 868eefeb17
commit 1080e512d4
1 file changed
+6 -1
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net/core/dev.c
+6 -1
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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 @@ ncls:
}
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);