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From: Weihang Li <liweihang@huawei.com>
To: <dledford@redhat.com>, <jgg@nvidia.com>
Cc: <leon@kernel.org>, <linux-rdma@vger.kernel.org>,
	<linuxarm@huawei.com>, Weihang Li <liweihang@huawei.com>,
	Faisal Latif <faisal.latif@intel.com>,
	Shiraz Saleem <shiraz.saleem@intel.com>
Subject: [PATCH v2 for-next 13/17] RDMA/i40iw: Use refcount_t instead of atomic_t on refcount of i40iw_cm_listener
Date: Fri, 21 May 2021 17:53:41 +0800	[thread overview]
Message-ID: <1621590825-60693-14-git-send-email-liweihang@huawei.com> (raw)
In-Reply-To: <1621590825-60693-1-git-send-email-liweihang@huawei.com>

The refcount_t API will WARN on underflow and overflow of a reference
counter, and avoid use-after-free risks.

Cc: Faisal Latif <faisal.latif@intel.com>
Cc: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
---
 drivers/infiniband/hw/i40iw/i40iw_cm.c | 10 +++++-----
 drivers/infiniband/hw/i40iw/i40iw_cm.h |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c
index 2450b7d..c1becb9 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c
@@ -1491,7 +1491,7 @@ static struct i40iw_cm_listener *i40iw_find_listener(
 		     !memcmp(listen_addr, ip_zero, sizeof(listen_addr))) &&
 		     (listen_port == dst_port) &&
 		     (listener_state & listen_node->listener_state)) {
-			atomic_inc(&listen_node->ref_count);
+			refcount_inc(&listen_node->ref_count);
 			spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 			return listen_node;
 		}
@@ -1910,7 +1910,7 @@ static int i40iw_dec_refcnt_listen(struct i40iw_cm_core *cm_core,
 		}
 	}
 
-	if (!atomic_dec_return(&listener->ref_count)) {
+	if (refcount_dec_and_test(&listener->ref_count)) {
 		spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 		list_del(&listener->list);
 		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
@@ -2870,7 +2870,7 @@ static struct i40iw_cm_listener *i40iw_make_listen_node(
 				       I40IW_CM_LISTENER_EITHER_STATE);
 	if (listener &&
 	    (listener->listener_state == I40IW_CM_LISTENER_ACTIVE_STATE)) {
-		atomic_dec(&listener->ref_count);
+		refcount_dec(&listener->ref_count);
 		i40iw_debug(cm_core->dev,
 			    I40IW_DEBUG_CM,
 			    "Not creating listener since it already exists\n");
@@ -2888,7 +2888,7 @@ static struct i40iw_cm_listener *i40iw_make_listen_node(
 
 		INIT_LIST_HEAD(&listener->child_listen_list);
 
-		atomic_set(&listener->ref_count, 1);
+		refcount_set(&listener->ref_count, 1);
 	} else {
 		listener->reused_node = 1;
 	}
@@ -3213,7 +3213,7 @@ void i40iw_receive_ilq(struct i40iw_sc_vsi *vsi, struct i40iw_puda_buf *rbuf)
 				    I40IW_DEBUG_CM,
 				    "%s allocate node failed\n",
 				    __func__);
-			atomic_dec(&listener->ref_count);
+			refcount_dec(&listener->ref_count);
 			return;
 		}
 		if (!tcph->rst && !tcph->fin) {
diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.h b/drivers/infiniband/hw/i40iw/i40iw_cm.h
index 6e43e4d..839966a 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.h
@@ -291,7 +291,7 @@ struct i40iw_cm_listener {
 	u32 loc_addr[4];
 	u16 loc_port;
 	struct iw_cm_id *cm_id;
-	atomic_t ref_count;
+	refcount_t ref_count;
 	struct i40iw_device *iwdev;
 	atomic_t pend_accepts_cnt;
 	int backlog;
-- 
2.7.4


  parent reply	other threads:[~2021-05-21  9:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-21  9:53 [PATCH v2 for-next 00/17] RDMA: Use refcount_t for reference counting Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 01/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of iwcm_id_private Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 02/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of iwpm_admin_data Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 03/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of ib_mad_snoop_private Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 04/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of mcast_member Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 05/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of mcast_port Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 06/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of mcast_group Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 07/17] RDMA/core: Use refcount_t instead of atomic_t on refcount of ib_uverbs_device Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 08/17] RDMA/hns: Use refcount_t instead of atomic_t for CQ reference counting Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 09/17] RDMA/hns: Use refcount_t instead of atomic_t for SRQ " Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 10/17] RDMA/hns: Use refcount_t instead of atomic_t for QP " Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 11/17] RDMA/cxgb4: Use refcount_t instead of atomic_t for " Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 12/17] RDMA/i40iw: Use refcount_t instead of atomic_t on refcount of i40iw_cqp_request Weihang Li
2021-05-22  9:41   ` Zhu Yanjun
2021-05-24  1:50     ` liweihang
2021-05-21  9:53 ` Weihang Li [this message]
2021-05-21  9:53 ` [PATCH v2 for-next 14/17] RDMA/i40iw: Use refcount_t instead of atomic_t on refcount of i40iw_puda_buf Weihang Li
2021-05-22  9:42   ` Zhu Yanjun
2021-05-21  9:53 ` [PATCH v2 for-next 15/17] RDMA/i40iw: Use refcount_t instead of atomic_t on refcount of i40iw_cm_node Weihang Li
2021-05-22  9:40   ` Zhu Yanjun
2021-05-21  9:53 ` [PATCH v2 for-next 16/17] RDMA/ipoib: Use refcount_t instead of atomic_t for reference counting Weihang Li
2021-05-21  9:53 ` [PATCH v2 for-next 17/17] RDMA/rdmavt: Use refcount_t instead of atomic_t on refcount of rvt_mcast Weihang Li

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