[PATCH] netfilter: ctnetlink: fix timeout calculation

[Xi Wang <xi.wang@gmail.com>]

The sanity check (timeout < 0) never works; the dividend is unsigned
and so is the division, which should have been a signed division.

	long timeout = (ct->timeout.expires - jiffies) / HZ;
	if (timeout < 0)
		timeout = 0;

This patch converts the time values to signed for the division.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
---
 net/netfilter/nf_conntrack_netlink.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index b697777..257e772 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -135,7 +135,7 @@ nla_put_failure:
 static inline int
 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 {
-	long timeout = (ct->timeout.expires - jiffies) / HZ;
+	long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
 
 	if (timeout < 0)
 		timeout = 0;
@@ -1641,7 +1641,7 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
 			  const struct nf_conntrack_expect *exp)
 {
 	struct nf_conn *master = exp->master;
-	long timeout = (exp->timeout.expires - jiffies) / HZ;
+	long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
 	struct nf_conn_help *help;
 
 	if (timeout < 0)
-- 
1.7.5.4