net, atm: convert lec_arp_table.usage 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>

2 files changed, 4 insertions, 4 deletions

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 75545717fa46..093fe8707731 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -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;
 }
 
diff --git a/net/atm/lec_arpc.h b/net/atm/lec_arpc.h
index ec67435a40a6..d923f53812a3 100644
--- a/net/atm/lec_arpc.h
+++ b/net/atm/lec_arpc.h
@@ -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 */
 };
 
 /*