On Mon, 2016-11-28 at 15:43 -0800, Daniele Di Proietto wrote:
> If nf_ct_frag6_gather() returns an error other than -EINPROGRESS, it
> means that we still have a reference to the skb. We should free it
> before returning from handle_fragments, as stated in the comment above.
>
> Fixes: daaa7d647f81 ("netfilter: ipv6: avoid nf_iterate recursion")
> CC: Florian Westphal <f...@strlen.de>
> CC: Pravin B Shelar <pshe...@ovn.org>
> CC: Joe Stringer <j...@ovn.org>
> Signed-off-by: Daniele Di Proietto <diproiet...@ovn.org>
> ---
> net/openvswitch/conntrack.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
> index 31045ef..fecefa2 100644
> --- a/net/openvswitch/conntrack.c
> +++ b/net/openvswitch/conntrack.c
> @@ -370,8 +370,11 @@ static int handle_fragments(struct net *net, struct
> sw_flow_key *key,
> skb_orphan(skb);
> memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
> err = nf_ct_frag6_gather(net, skb, user);
> - if (err)
> + if (err) {
> + if (err != -EINPROGRESS)
> + kfree_skb(skb);
> return err;
> + }
>
> key->ip.proto = ipv6_hdr(skb)->nexthdr;
> ovs_cb.mru = IP6CB(skb)->frag_max_size;
Interesting, have you followed the "GPF in eth_header" thread today ?
In a nutshell, we want a complete patch, not something that would solve
part of the problem.
