1 files changed, 5 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_seqadj.c b/net/netfilter/nf_conntrack_seqadj.c
index 17c1bcb182c6..b2d38da67822 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);