[IPV4]: Fix BUG of ip_rt_send_redirect()

Fix the redirect packet of the router if the jiffies wraparound.

Signed-off-by: Li Yewang <lyw@nanjing-fnst.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1aaff0a..2daa0dc 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1325,7 +1325,8 @@ void ip_rt_send_redirect(struct sk_buff *skb)
        /* Check for load limit; set rate_last to the latest sent
         * redirect.
         */
-       if (time_after(jiffies,
+       if (rt->u.dst.rate_tokens == 0 ||
+           time_after(jiffies,
                       (rt->u.dst.rate_last +
                        (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) {
                icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway);