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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-05-06 00:53:53 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-06 00:53:53 -0700 |
| commit | 6ec82562ffc6f297d0de36d65776cff8e5704867 (patch) | |
| tree | 5c023102ddce1ae5f5a7b05f1f42766537ef86d1 /net/core/dev.c | |
| parent | d40a4de0be08f005814a4fddac748fe5353208ec (diff) | |
| download | lwn-6ec82562ffc6f297d0de36d65776cff8e5704867.tar.gz lwn-6ec82562ffc6f297d0de36d65776cff8e5704867.zip | |
veth: Dont kfree_skb() after dev_forward_skb()
In case of congestion, netif_rx() frees the skb, so we must assume
dev_forward_skb() also consume skb.
Bug introduced by commit 445409602c092
(veth: move loopback logic to common location)
We must change dev_forward_skb() to always consume skb, and veth to not
double free it.
Bug report : http://marc.info/?l=linux-netdev&m=127310770900442&w=3
Reported-by: Martín Ferrari <martin.ferrari@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index f769098774b7..264137fce3a2 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1451,7 +1451,7 @@ static inline void net_timestamp(struct sk_buff *skb) * * return values: * NET_RX_SUCCESS (no congestion) - * NET_RX_DROP (packet was dropped) + * NET_RX_DROP (packet was dropped, but freed) * * dev_forward_skb can be used for injecting an skb from the * start_xmit function of one device into the receive queue @@ -1465,12 +1465,11 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) { skb_orphan(skb); - if (!(dev->flags & IFF_UP)) - return NET_RX_DROP; - - if (skb->len > (dev->mtu + dev->hard_header_len)) + if (!(dev->flags & IFF_UP) || + (skb->len > (dev->mtu + dev->hard_header_len))) { + kfree_skb(skb); return NET_RX_DROP; - + } skb_set_dev(skb, dev); skb->tstamp.tv64 = 0; skb->pkt_type = PACKET_HOST; |