[net PATCH 1/2] netfilter: WARN about wrong usage of sequence number adjustments

[Jesper Dangaard Brouer <brouer@xxxxxxxxxx>]

Since commit 41d73ec053d2 (netfilter: nf_conntrack: make sequence
number adjustments usuable without NAT), the sequence number extension
is dynamically allocated.

Instead of dying, give a WARN splash, in case of wrong usage of the
seqadj code, e.g. when forgetting to allocate via nfct_seqadj_ext_add().

Wrong usage have been seen in the IPVS code path.

Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
---

 net/netfilter/nf_conntrack_seqadj.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/nf_conntrack_seqadj.c 
b/net/netfilter/nf_conntrack_seqadj.c
index 17c1bcb..b2d38da 100644
--- a/net/netfilter/nf_conntrack_seqadj.c
+++ b/net/netfilter/nf_conntrack_seqadj.c
@@ -36,6 +36,11 @@ int nf_ct_seqadj_set(struct nf_conn *ct, enum 
ip_conntrack_info ctinfo,
        if (off == 0)
                return 0;
 
+       if (unlikely(!seqadj)) {
+               WARN(1, "Wrong seqadj usage, missing nfct_seqadj_ext_add()\n");
+               return 0;
+       }
+
        set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
 
        spin_lock_bh(&ct->lock);

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