From: Elena Reshetova <elena.reshetova@intel.com>
To: davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org
Cc: peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org,
zbr-i6C2adt8DTjR7s880joybQ@public.gmane.org,
Elena Reshetova
<elena.reshetova-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
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Subject: [PATCH 04/15] drivers, net, mlx4: convert mlx4_qp.refcount from atomic_t to refcount_t
Date: Fri, 20 Oct 2017 07:23:38 +0000 [thread overview]
Message-ID: <1508484229-19706-5-git-send-email-elena.reshetova@intel.com> (raw)
In-Reply-To: <1508484229-19706-1-git-send-email-elena.reshetova-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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 mlx4_qp.refcount is used as pure reference counter.
Convert it to refcount_t and fix up the operations.
Suggested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Windsor <dwindsor@gmail.com>
Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
---
drivers/net/ethernet/mellanox/mlx4/qp.c | 8 ++++----
include/linux/mlx4/device.h | 2 +-
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/qp.c b/drivers/net/ethernet/mellanox/mlx4/qp.c
index 2033209..769598f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/qp.c
+++ b/drivers/net/ethernet/mellanox/mlx4/qp.c
@@ -55,7 +55,7 @@ void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
qp = __mlx4_qp_lookup(dev, qpn);
if (qp)
- atomic_inc(&qp->refcount);
+ refcount_inc(&qp->refcount);
spin_unlock(&qp_table->lock);
@@ -66,7 +66,7 @@ void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
qp->event(qp, event_type);
- if (atomic_dec_and_test(&qp->refcount))
+ if (refcount_dec_and_test(&qp->refcount))
complete(&qp->free);
}
@@ -420,7 +420,7 @@ int mlx4_qp_alloc(struct mlx4_dev *dev, int qpn, struct mlx4_qp *qp)
if (err)
goto err_icm;
- atomic_set(&qp->refcount, 1);
+ refcount_set(&qp->refcount, 1);
init_completion(&qp->free);
return 0;
@@ -520,7 +520,7 @@ EXPORT_SYMBOL_GPL(mlx4_qp_remove);
void mlx4_qp_free(struct mlx4_dev *dev, struct mlx4_qp *qp)
{
- if (atomic_dec_and_test(&qp->refcount))
+ if (refcount_dec_and_test(&qp->refcount))
complete(&qp->free);
wait_for_completion(&qp->free);
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index daac2e3..b8e19c4 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -768,7 +768,7 @@ struct mlx4_qp {
int qpn;
- atomic_t refcount;
+ refcount_t refcount;
struct completion free;
u8 usage;
};
--
2.7.4
next prev parent reply other threads:[~2017-10-20 7:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 7:23 [PATCH 00/15] networking drivers refcount_t conversions Elena Reshetova
2017-10-20 7:23 ` [PATCH 01/15] drivers, net, ethernet: convert clip_entry.refcnt from atomic_t to refcount_t Elena Reshetova
2017-10-20 7:23 ` [PATCH 02/15] drivers, net, ethernet: convert mtk_eth.dma_refcnt " Elena Reshetova
[not found] ` <1508484229-19706-3-git-send-email-elena.reshetova-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-10-20 8:08 ` Sean Wang
2017-10-20 10:37 ` Reshetova, Elena
2017-10-22 4:06 ` Sean Wang
2017-10-23 6:37 ` Reshetova, Elena
2017-10-20 7:23 ` [PATCH 03/15] drivers, net, mlx4: convert mlx4_cq.refcount " Elena Reshetova
[not found] ` <1508484229-19706-1-git-send-email-elena.reshetova-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-10-20 7:23 ` Elena Reshetova [this message]
2017-10-20 7:23 ` [PATCH 05/15] drivers, net, mlx4: convert mlx4_srq.refcount " Elena Reshetova
2017-10-20 7:23 ` [PATCH 06/15] drivers, net, mlx5: convert mlx5_cq.refcount " Elena Reshetova
2017-10-20 7:23 ` [PATCH 07/15] drivers, net, mlx5: convert fs_node.refcount " Elena Reshetova
2017-10-20 7:23 ` [PATCH 08/15] drivers, net, hamradio: convert sixpack.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 09/15] drivers, net: convert masces_rx_sa.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 10/15] drivers, net: convert masces_rx_sc.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 11/15] drivers, net: convert masces_tx_sa.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 12/15] drivers, net, ppp: convert asyncppp.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 13/15] drivers, net, ppp: convert ppp_file.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 14/15] drivers, net, ppp: convert syncppp.refcnt " Elena Reshetova
2017-10-20 7:23 ` [PATCH 15/15] drivers, connector: convert cn_callback_entry.refcnt " Elena Reshetova
2017-10-22 1:31 ` [PATCH 00/15] networking drivers refcount_t conversions David Miller
2017-10-23 6:34 ` Reshetova, Elena
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