[PATCH 09/16] drivers, net: convert masces_rx_sa.refcnt from atomic_t to refcount_t
From: elena.reshetova@intel.com (Elena Reshetova)
Date: 2017-03-28 08:58:35
Also in:
linux-hams, linux-rdma, linux-wireless, lkml, netdev
Subsystem:
networking drivers, networking [macsec], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Sabrina Dubroca, Linus Torvalds
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 <redacted> Signed-off-by: Kees Cook <redacted> Signed-off-by: David Windsor <redacted> --- 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 ff0a5ed..bc0b00a 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); }
@@ -1324,7 +1325,7 @@ 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); spin_lock_init(&rx_sa->lock); return 0;
--
2.7.4