[IPV4]: rt_cache_get_next should take rt_genid into account.

In the other case /proc/net/rt_cache will look inconsistent in respect to
genid.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 5 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ad6eadd12b4a..f9654f2ae5b3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -294,7 +294,8 @@ static struct rtable *rt_cache_get_first(struct rt_cache_iter_state *st)
         return r;
 }
 
-static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st, struct rtable *r)
+static struct rtable *__rt_cache_get_next(struct rt_cache_iter_state *st,
+                                          struct rtable *r)
 {
         r = r->u.dst.rt_next;
         while (!r) {
@@ -307,16 +308,23 @@ static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st, struct r
         return rcu_dereference(r);
 }
 
+static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st,
+                                        struct rtable *r)
+{
+        while ((r = __rt_cache_get_next(st, r)) != NULL) {
+                if (r->rt_genid == st->genid)
+                        break;
+        }
+        return r;
+}
+
 static struct rtable *rt_cache_get_idx(struct rt_cache_iter_state *st, loff_t pos)
 {
         struct rtable *r = rt_cache_get_first(st);
 
         if (r)
-                while (pos && (r = rt_cache_get_next(st, r))) {
-                        if (r->rt_genid != st->genid)
-                                continue;
+                while (pos && (r = rt_cache_get_next(st, r)))
                         --pos;
-                }
         return pos ? NULL : r;
 }