[PATCH 4.19 07/90] netfilter: nft_flow_offload: IPCB is only valid for ipv4 family

Greg Kroah-Hartman
2019-07-08T15:40:18Z

From: Florian Westphal <fw@strlen.de>

commit 69aeb538587e087bfc81dd1f465eab3558ff3158 upstream.

Guard this with a check vs. ipv4, IPCB isn't valid in ipv6 case.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/netfilter/nft_flow_offload.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -48,15 +48,20 @@ static int nft_flow_route(const struct n
return 0;
}

-static bool nft_flow_offload_skip(struct sk_buff *skb)
+static bool nft_flow_offload_skip(struct sk_buff *skb, int family)
{
- struct ip_options *opt = &(IPCB(skb)->opt);
-
- if (unlikely(opt->optlen))
- return true;
if (skb_sec_path(skb))
return true;

+ if (family == NFPROTO_IPV4) {
+ const struct ip_options *opt;
+
+ opt = &(IPCB(skb)->opt);
+
+ if (unlikely(opt->optlen))
+ return true;
+ }
+
return false;
}

@@ -74,7 +79,7 @@ static void nft_flow_offload_eval(const
struct nf_conn *ct;
int ret;

- if (nft_flow_offload_skip(pkt->skb))
+ if (nft_flow_offload_skip(pkt->skb, nft_pf(pkt)))
goto out;

ct = nf_ct_get(pkt->skb, &ctinfo);