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net, atm: convert lec_arp_table.usage from atomic_t to refcount_t

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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 2017-07-04 15:53:02 +03:00 committed by David S. Miller
parent 458bc30cec
commit 788936641a
2 changed files with 4 additions and 4 deletions
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6
net/atm/lec.c
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@ -101,12 +101,12 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
/* must be done under lec_arp_lock */
static inline void lec_arp_hold(struct lec_arp_table *entry)
{
atomic_inc(&entry->usage);
refcount_inc(&entry->usage);
}
static inline void lec_arp_put(struct lec_arp_table *entry)
{
if (atomic_dec_and_test(&entry->usage))
if (refcount_dec_and_test(&entry->usage))
kfree(entry);
}
@ -1564,7 +1564,7 @@ static struct lec_arp_table *make_entry(struct lec_priv *priv,
to_return->last_used = jiffies;
to_return->priv = priv;
skb_queue_head_init(&to_return->tx_wait);
atomic_set(&to_return->usage, 1);
refcount_set(&to_return->usage, 1);
return to_return;
}

2
net/atm/lec_arpc.h
View File

@ -47,7 +47,7 @@ struct lec_arp_table {
* the length of the tlvs array
*/
struct sk_buff_head tx_wait; /* wait queue for outgoing packets */
atomic_t usage; /* usage count */
refcount_t usage; /* usage count */
};
/*