From db12cf27435356017e7ab375ef5e82a1cc749384 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Mon, 16 Dec 2013 17:09:41 +0100 Subject: [PATCH] netfilter: WARN about wrong usage of sequence number adjustments 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 Acked-by: Julian Anastasov Signed-off-by: Simon Horman --- net/netfilter/nf_conntrack_seqadj.c | 5 +++++ 1 file changed, 5 insertions(+) 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); -- 2.39.5