[PATCH 09/15] drivers, net: convert masces_rx_sa.refcnt from atomic_t to refcount_t

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atomic_t variables are currently used to implement reference
counters with the following properties:
 - counter is initialized to 1 using atomic_set()
 - a resource is freed upon counter reaching zero
 - once counter reaches zero, its further
   increments aren't allowed
 - counter schema uses basic atomic operations
   (set, inc, inc_not_zero, dec_and_test, etc.)

Such atomic variables should be converted to a newly provided
refcount_t type and API that prevents accidental counter overflows
and underflows. This is important since overflows and underflows
can lead to use-after-free situation and be exploitable.

The variable masces_rx_sa.refcnt is used as pure reference counter.
Convert it to refcount_t and fix up the operations.

Suggested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: David Windsor <dwindsor@xxxxxxxxx>
Reviewed-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Signed-off-by: Elena Reshetova <elena.reshetova@xxxxxxxxx>
 drivers/net/macsec.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index ccbe4eaf..733e1c2 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -16,6 +16,7 @@
 #include <crypto/aead.h>
 #include <linux/etherdevice.h>
 #include <linux/rtnetlink.h>
+#include <linux/refcount.h>
 #include <net/genetlink.h>
 #include <net/sock.h>
 #include <net/gro_cells.h>
@@ -146,7 +147,7 @@ struct macsec_rx_sa {
 	struct macsec_key key;
 	spinlock_t lock;
 	u32 next_pn;
-	atomic_t refcnt;
+	refcount_t refcnt;
 	bool active;
 	struct macsec_rx_sa_stats __percpu *stats;
 	struct macsec_rx_sc *sc;
@@ -314,7 +315,7 @@ static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
 	if (!sa || !sa->active)
 		return NULL;
-	if (!atomic_inc_not_zero(&sa->refcnt))
+	if (!refcount_inc_not_zero(&sa->refcnt))
 		return NULL;
 	return sa;
@@ -350,7 +351,7 @@ static void free_rxsa(struct rcu_head *head)
 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
-	if (atomic_dec_and_test(&sa->refcnt))
+	if (refcount_dec_and_test(&sa->refcnt))
 		call_rcu(&sa->rcu, free_rxsa);
@@ -1339,7 +1340,7 @@ static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
 	rx_sa->active = false;
 	rx_sa->next_pn = 1;
-	atomic_set(&rx_sa->refcnt, 1);
+	refcount_set(&rx_sa->refcnt, 1);
 	return 0;

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