[PATCH][nf-next] netfilter: Use RCU primitives under RCU protected data

[Li RongQing]

This pointer is RCU protected, so proper primitives should be used.

Signed-off-by: Zhang Yu <zhangy...@baidu.com>
Signed-off-by: Li RongQing <lirongq...@baidu.com>
---
 net/netfilter/xt_CT.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
index 0fa863f57575..26dee8bba326 100644
--- a/net/netfilter/xt_CT.c
+++ b/net/netfilter/xt_CT.c
@@ -99,7 +99,7 @@ xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
                return -ENOMEM;
        }
 
-       help->helper = helper;
+       RCU_INIT_POINTER(help->helper, helper);
        return 0;
 }
 
@@ -274,7 +274,7 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par,
 err4:
        help = nfct_help(ct);
        if (help)
-               nf_conntrack_helper_put(help->helper);
+               nf_conntrack_helper_put(rcu_dereference(help->helper));
 err3:
        nf_ct_tmpl_free(ct);
 err2:
@@ -357,7 +357,7 @@ static void xt_ct_tg_destroy(const struct xt_tgdtor_param 
*par,
        if (ct) {
                help = nfct_help(ct);
                if (help)
-                       nf_conntrack_helper_put(help->helper);
+                       nf_conntrack_helper_put(rcu_dereference(help->helper));
 
                nf_ct_netns_put(par->net, par->family);
 
-- 
2.16.2