On Tue, Apr 1, 2014 at 5:23 PM, Wei Zhang <asuka....@163.com> wrote:
> When use gre vport, openvswitch register a gre_cisco_protocol but does not
> supply a err_handler with it. The gre_cisco_err() in net/ipv4/gre_demux.c
> expect
> err_handler be provided with the gre_cisco_protocol implementation, and call
> ->err_handler() without existence check, cause the kernel crash.
>
> This patch provide a err_handler to fix this bug.
>
> v2 -> v1: use the same logic of the gre_rcv() to distinguish which packet is
> intended to us!
As a tip on kernel process: if you put the version information after
three dashes below the signed-off-by line then git will automatically
remove it when the final patch is applied.
> diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
> index a3d6951..f391df1 100644
> --- a/net/openvswitch/vport-gre.c
> +++ b/net/openvswitch/vport-gre.c
> @@ -110,6 +110,21 @@ static int gre_rcv(struct sk_buff *skb,
> return PACKET_RCVD;
> }
>
> +/* Called with rcu_read_lock and BH disabled. */
> +static int gre_err(struct sk_buff *skb, u32 info,
> + const struct tnl_ptk_info *tpi)
> +{
> + struct ovs_net *ovs_net;
> + struct vport *vport;
> +
> + ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
> + vport = rcu_dereference(ovs_net->vport_net.gre_vport);
> + if (unlikely(!vport))
> + return PACKET_REJECT;
> + else
> + return PACKET_RCVD;
Sorry, I forgot to say this before - if we receive the packet then we
should also call consume_skb() on it.
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