From: Julian Anastasov <ja@xxxxxx>
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@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
net/netfilter/ipvs/ip_vs_ctl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 9e4074c..5a65444 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),
--
1.7.10.4
--
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