ipv4: Fix route refcount on pmtu discovery

git commit 9cb3a50c (ipv4: Invalidate the socket cached route on
pmtu events if possible) introduced a refcount problem. We don't
get a refcount on the route if we get it from__sk_dst_get(), but
we need one if we want to reuse this route because __sk_dst_set()
releases the refcount of the old route. This patch adds proper
refcount handling for that case. We introduce a 'new' flag to
indicate that we are going to use a new route and we release the
old route only if we replace it by a new one.

Reported-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 132737a7c83a..a0fcc47fee73 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -985,6 +985,7 @@ void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
         struct flowi4 fl4;
         struct rtable *rt;
         struct dst_entry *dst;
+        bool new = false;
 
         bh_lock_sock(sk);
         rt = (struct rtable *) __sk_dst_get(sk);
@@ -1000,20 +1001,26 @@ void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
                 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
                 if (IS_ERR(rt))
                         goto out;
+
+                new = true;
         }
 
         __ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu);
 
         dst = dst_check(&rt->dst, 0);
         if (!dst) {
+                if (new)
+                        dst_release(&rt->dst);
+
                 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
                 if (IS_ERR(rt))
                         goto out;
 
-                dst = &rt->dst;
+                new = true;
         }
 
-         __sk_dst_set(sk, dst);
+        if (new)
+                __sk_dst_set(sk, &rt->dst);
 
 out:
         bh_unlock_sock(sk);