linux-kernel - [PATCH 4.18 150/158] RDMA/hns: Add illegal hop

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Date:   Tue, 18 Sep 2018 00:43:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lijun Ou <oulijun@...wei.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 150/158] RDMA/hns: Add illegal hop_num judgement

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lijun Ou <oulijun@...wei.com>

[ Upstream commit 26f63b9c33ceda12fb9136a1d0c80e03c9ebb514 ]

When hop_num is more than three, it need to return -EINVAL.  This patch
fixes it.

Signed-off-by: Lijun Ou <oulijun@...wei.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/hw/hns/hns_roce_hem.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/infiniband/hw/hns/hns_roce_hem.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
@@ -494,6 +494,9 @@ static int hns_roce_table_mhop_get(struc
 			step_idx = 1;
 		} else if (hop_num == HNS_ROCE_HOP_NUM_0) {
 			step_idx = 0;
+		} else {
+			ret = -EINVAL;
+			goto err_dma_alloc_l1;
 		}
 
 		/* set HEM base address to hardware */