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net: convert neigh_params.refcnt from atomic_t to refcount_t 

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:07:56 +03:00 committed by David S. Miller
parent 9f23743017
commit 6343944bc1
2 changed files with 7 additions and 7 deletions
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6
include/net/neighbour.h
View File

@ -77,7 +77,7 @@ struct neigh_parms {
void *sysctl_table;
int dead;
atomic_t refcnt;
refcount_t refcnt;
struct rcu_head rcu_head;
int reachable_time;
@ -396,12 +396,12 @@ void neigh_sysctl_unregister(struct neigh_parms *p);
static inline void __neigh_parms_put(struct neigh_parms *parms)
{
atomic_dec(&parms->refcnt);
refcount_dec(&parms->refcnt);
}
static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
{
atomic_inc(&parms->refcnt);
refcount_inc(&parms->refcnt);
return parms;
}

8
net/core/neighbour.c
View File

@ -709,7 +709,7 @@ static void neigh_parms_destroy(struct neigh_parms *parms);
static inline void neigh_parms_put(struct neigh_parms *parms)
{
if (atomic_dec_and_test(&parms->refcnt))
if (refcount_dec_and_test(&parms->refcnt))
neigh_parms_destroy(parms);
}
@ -1479,7 +1479,7 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL);
if (p) {
p->tbl = tbl;
atomic_set(&p->refcnt, 1);
refcount_set(&p->refcnt, 1);
p->reachable_time =
neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME));
dev_hold(dev);
@ -1542,7 +1542,7 @@ void neigh_table_init(int index, struct neigh_table *tbl)
INIT_LIST_HEAD(&tbl->parms_list);
list_add(&tbl->parms.list, &tbl->parms_list);
write_pnet(&tbl->parms.net, &init_net);
atomic_set(&tbl->parms.refcnt, 1);
refcount_set(&tbl->parms.refcnt, 1);
tbl->parms.reachable_time =
neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME));
@ -1796,7 +1796,7 @@ static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms)
if ((parms->dev &&
nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) ||
nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) ||
nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) ||
nla_put_u32(skb, NDTPA_QUEUE_LENBYTES,
NEIGH_VAR(parms, QUEUE_LEN_BYTES)) ||
/* approximative value for deprecated QUEUE_LEN (in packets) */