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

Message ID d0ef01eeb9030a329da44df2cf642898f2f6a3ac.1337202879.git.mst@redhat.com
State RFC, archived
Delegated to: David Miller
Headers show

Commit Message

Michael S. Tsirkin May 16, 2012, 9:16 p.m. UTC 
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>
---
 net/core/dev.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
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Patch

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);
 }