Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma

[linux-2.6-block.git] / net / netfilter / ipvs / ip_vs_core.c

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 5d2b806a862e6834ff6c61aee5c0e0a899bbe4b8..38fbc194b9cb72835c497439713d23f16d99ca8c 100644 (file)
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -319,7 +319,13 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                 * return *ignored=0 i.e. ICMP and NF_DROP
                 */
                sched = rcu_dereference(svc->scheduler);
-               dest = sched->schedule(svc, skb, iph);
+               if (sched) {
+                       /* read svc->sched_data after svc->scheduler */
+                       smp_rmb();
+                       dest = sched->schedule(svc, skb, iph);
+               } else {
+                       dest = NULL;
+               }
                if (!dest) {
                        IP_VS_DBG(1, "p-schedule: no dest found.\n");
                        kfree(param.pe_data);
@@ -467,7 +473,13 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
        }
 
        sched = rcu_dereference(svc->scheduler);
-       dest = sched->schedule(svc, skb, iph);
+       if (sched) {
+               /* read svc->sched_data after svc->scheduler */
+               smp_rmb();
+               dest = sched->schedule(svc, skb, iph);
+       } else {
+               dest = NULL;
+       }
        if (dest == NULL) {
                IP_VS_DBG(1, "Schedule: no dest found.\n");
                return NULL;