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(-)
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)