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net: sched: act_sample: fix psample group handling on overwrite

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Action sample doesn't properly handle psample_group pointer in overwrite
case. Following issues need to be fixed:

- In tcf_sample_init() function RCU_INIT_POINTER() is used to set
  s->psample_group, even though we neither setting the pointer to NULL, nor
  preventing concurrent readers from accessing the pointer in some way.
  Use rcu_swap_protected() instead to safely reset the pointer.

- Old value of s->psample_group is not released or deallocated in any way,
  which results resource leak. Use psample_group_put() on non-NULL value
  obtained with rcu_swap_protected().

- The function psample_group_put() that released reference to struct
  psample_group pointed by rcu-pointer s->psample_group doesn't respect rcu
  grace period when deallocating it. Extend struct psample_group with rcu
  head and use kfree_rcu when freeing it.

Fixes: 5c5670fae4 ("net/sched: Introduce sample tc action")
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2019-08-27 21:49:38 +03:00 committed by David S. Miller
parent 36f1031c51
commit dbf47a2a09
3 changed files with 7 additions and 2 deletions
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1
include/net/psample.h
View File

@ -11,6 +11,7 @@ struct psample_group {
u32 group_num;
u32 refcount;
u32 seq;
struct rcu_head rcu;
};
struct psample_group *psample_group_get(struct net *net, u32 group_num);

2
net/psample/psample.c
View File

@ -154,7 +154,7 @@ static void psample_group_destroy(struct psample_group *group)
{
psample_group_notify(group, PSAMPLE_CMD_DEL_GROUP);
list_del(&group->list);
kfree(group);
kfree_rcu(group, rcu);
}
static struct psample_group *

6
net/sched/act_sample.c
View File

@ -102,13 +102,17 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
s->rate = rate;
s->psample_group_num = psample_group_num;
RCU_INIT_POINTER(s->psample_group, psample_group);
rcu_swap_protected(s->psample_group, psample_group,
lockdep_is_held(&s->tcf_lock));
if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
s->truncate = true;
s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
}
spin_unlock_bh(&s->tcf_lock);
if (psample_group)
psample_group_put(psample_group);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);