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net/sched: properly assign RCU pointer in tcf_chain_tp_insert/remove 

*p_filter_chain is rcu-dereferenced on reader path. So here in writer,
property assign the pointer.

Fixes: 2190d1d094 ("net: sched: introduce helpers to work with filter chains")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2017-05-20 15:01:31 +02:00 committed by David S. Miller
parent 218b6a5b23
commit 31efcc250a
1 changed files with 2 additions and 2 deletions
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4
net/sched/cls_api.c
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@ -351,7 +351,7 @@ static void tcf_chain_tp_insert(struct tcf_chain *chain,
{
if (chain->p_filter_chain &&
*chain_info->pprev == chain->filter_chain)
*chain->p_filter_chain = tp;
rcu_assign_pointer(*chain->p_filter_chain, tp);
RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
rcu_assign_pointer(*chain_info->pprev, tp);
}
@ -363,7 +363,7 @@ static void tcf_chain_tp_remove(struct tcf_chain *chain,
struct tcf_proto *next = rtnl_dereference(chain_info->next);
if (chain->p_filter_chain && tp == chain->filter_chain)
*chain->p_filter_chain = next;
RCU_INIT_POINTER(*chain->p_filter_chain, next);
RCU_INIT_POINTER(*chain_info->pprev, next);
}