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@xxxxxxxxx> Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: David Windsor <dwindsor@xxxxxxxxx> --- net/rds/ib.c | 12 ++++++------ net/rds/ib.h | 2 +- net/rds/ib_rdma.c | 4 ++-- 3 files changed, 9 insertions(+), 9 deletions(-) diff --git a/net/rds/ib.c b/net/rds/ib.c index 91fe46f..bb19cda 100644 --- a/net/rds/ib.c +++ b/net/rds/ib.c @@ -118,8 +118,8 @@ static void rds_ib_dev_free(struct work_struct *work) void rds_ib_dev_put(struct rds_ib_device *rds_ibdev) { - BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0); - if (atomic_dec_and_test(&rds_ibdev->refcount)) + BUG_ON(refcount_read(&rds_ibdev->refcount) == 0); + if (refcount_dec_and_test(&rds_ibdev->refcount)) queue_work(rds_wq, &rds_ibdev->free_work); } @@ -137,7 +137,7 @@ static void rds_ib_add_one(struct ib_device *device) return; spin_lock_init(&rds_ibdev->spinlock); - atomic_set(&rds_ibdev->refcount, 1); + refcount_set(&rds_ibdev->refcount, 1); INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); rds_ibdev->max_wrs = device->attrs.max_qp_wr; @@ -205,10 +205,10 @@ static void rds_ib_add_one(struct ib_device *device) down_write(&rds_ib_devices_lock); list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices); up_write(&rds_ib_devices_lock); - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); ib_set_client_data(device, &rds_ib_client, rds_ibdev); - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rds_ib_nodev_connect(); @@ -239,7 +239,7 @@ struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device) rcu_read_lock(); rds_ibdev = ib_get_client_data(device, &rds_ib_client); if (rds_ibdev) - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rcu_read_unlock(); return rds_ibdev; } diff --git a/net/rds/ib.h b/net/rds/ib.h index ec55062..bf48224 100644 --- a/net/rds/ib.h +++ b/net/rds/ib.h @@ -230,7 +230,7 @@ struct rds_ib_device { unsigned int max_initiator_depth; unsigned int max_responder_resources; spinlock_t spinlock; /* protect the above */ - atomic_t refcount; + refcount_t refcount; struct work_struct free_work; int *vector_load; }; diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 977f698..9a3c54e 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -52,7 +52,7 @@ static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr) list_for_each_entry_rcu(rds_ibdev, &rds_ib_devices, list) { list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { if (i_ipaddr->ipaddr == ipaddr) { - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rcu_read_unlock(); return rds_ibdev; } @@ -134,7 +134,7 @@ void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *con spin_unlock_irq(&ib_nodev_conns_lock); ic->rds_ibdev = rds_ibdev; - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); } void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html