linux-kernel - [PATCH AUTOSEL 4.9 05/26] RDMA/cm: Add missing locking around id.state in cm_dup_req

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Message-Id: <20200411231413.26911-5-sashal@kernel.org>
Date:   Sat, 11 Apr 2020 19:13:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jason Gunthorpe <jgg@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Sasha Levin <sashal@...nel.org>, linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 05/26] RDMA/cm: Add missing locking around id.state in cm_dup_req_handler

From: Jason Gunthorpe <jgg@...lanox.com>

[ Upstream commit d1de9a88074b66482443f0cd91618d7b51a7c9b6 ]

All accesses to id.state must be done under the spinlock.

Fixes: a977049dacde ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-10-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/core/cm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 304429fd04ddb..c764a29c11323 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -1544,8 +1544,12 @@ static void cm_dup_req_handler(struct cm_work *work,
 			counter[CM_REQ_COUNTER]);
 
 	/* Quick state check to discard duplicate REQs. */
-	if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
+	spin_lock_irq(&cm_id_priv->lock);
+	if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
+		spin_unlock_irq(&cm_id_priv->lock);
 		return;
+	}
+	spin_unlock_irq(&cm_id_priv->lock);
 
 	ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
 	if (ret)
-- 
2.20.1