linux-kernel - [PATCHv2-RFC 5/6] net: orphan frags on receive

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Message-ID: <d0ef01eeb9030a329da44df2cf642898f2f6a3ac.1337202879.git.mst@redhat.com>
Date:	Thu, 17 May 2012 00:16:16 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jason Wang <jasowang@...hat.com>, eric.dumazet@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, davem@...emloft.net
Subject: [PATCHv2-RFC 5/6] net: orphan frags on receive

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@...hat.com>
---
 net/core/dev.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 66cae6e..cd7d421 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1628,6 +1628,8 @@ 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);
 }
-- 
MST

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