ipvs: properly dereference dest_dst in ip_vs_forget_dev

Use rcu_dereference_protected to resolve
sparse warning, found by kbuild test robot:

net/netfilter/ipvs/ip_vs_ctl.c:1464:35: warning: dereference of
noderef expression

Problem from commit 026ace060dfe29
("ipvs: optimize dst usage for real server")

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 9e4074c26dc2..5a6544475b3c 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1460,8 +1460,11 @@ void ip_vs_service_net_cleanup(struct net *net)
 static inline void
 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
 {
+        struct ip_vs_dest_dst *dest_dst;
+
         spin_lock_bh(&dest->dst_lock);
-        if (dest->dest_dst && dest->dest_dst->dst_cache->dev == dev) {
+        dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
+        if (dest_dst && dest_dst->dst_cache->dev == dev) {
                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
                               dev->name,
                               IP_VS_DBG_ADDR(dest->af, &dest->addr),