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

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Message-Id: <20190708150522.821819621@linuxfoundation.org>
Date:   Mon,  8 Jul 2019 17:12:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.19 07/90] netfilter: nft_flow_offload: IPCB is only valid for ipv4 family

From: Florian Westphal <fw@...len.de>

commit 69aeb538587e087bfc81dd1f465eab3558ff3158 upstream.

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

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);