[v2,4.14,5/5] netfilter: nf_conncount: don't skip eviction when age is negative
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Message ID 20190102204204.12389-6-mfo@canonical.com
State Not Applicable
Delegated to: David Miller
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Series
  • netfilter: xt_connlimit: backport upstream fixes for race in connection counting
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Commit Message

Mauricio Faria de Oliveira Jan. 2, 2019, 8:42 p.m. UTC
From: Florian Westphal <fw@strlen.de>

commit 4cd273bb91b3001f623f516ec726c49754571b1a upstream.

(not in Linus's tree now, but in nf.git + linux-next.git already.)

age is signed integer, so result can be negative when the timestamps
have a large delta.  In this case we want to discard the entry.

Instead of using age >= 2 || age < 0, just make it unsigned.

Fixes: b36e4523d4d56 ("netfilter: nf_conncount: fix garbage collection confirm race")
Reviewed-by: Shawn Bohrer <sbohrer@cloudflare.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

[mfo: backport: use older file name, nf_conncount.c -> xt_connlimit.c]
Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
---
 net/netfilter/xt_connlimit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index 913b86ef..b1646c2 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -141,7 +141,7 @@  find_or_evict(struct net *net, struct xt_connlimit_conn *conn)
 	const struct nf_conntrack_tuple_hash *found;
 	unsigned long a, b;
 	int cpu = raw_smp_processor_id();
-	__s32 age;
+	u32 age;
 
 	found = nf_conntrack_find_get(net, &conn->zone, &conn->tuple);
 	if (found)