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

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Submitter Jesper Dangaard Brouer
Date Dec. 16, 2013, 4:09 p.m.
Message ID <20131216160941.22853.46561.stgit@dragon>
Download mbox | patch
Permalink /patch/301755/
State Awaiting Upstream
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Comments

Jesper Dangaard Brouer - Dec. 16, 2013, 4:09 p.m.
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@redhat.com>
---

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


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Patch

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);