linux-kernel - [PATCH 4.14 177/246] net: hns3: Fixes the out of bounds access in hclge_map

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Date:   Wed,  1 Aug 2018 18:51:27 +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, Huazhong Tan <tanhuazhong@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 177/246] net: hns3: Fixes the out of bounds access in hclge_map_tqp

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

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

From: Huazhong Tan <tanhuazhong@...wei.com>

[ Upstream commit 38e62046d4c95272e2fb001d2d72baf48fa090e9 ]

This patch fixes the handling of the check when number of vports
are detected to be more than available TPQs. Current handling causes
an out of bounds access in hclge_map_tqp().

Fixes: 7df7dad633e2 ("net: hns3: Refactor the mapping of tqp to vport")
Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -1272,8 +1272,11 @@ static int hclge_alloc_vport(struct hclg
 	/* We need to alloc a vport for main NIC of PF */
 	num_vport = hdev->num_vmdq_vport + hdev->num_req_vfs + 1;
 
-	if (hdev->num_tqps < num_vport)
-		num_vport = hdev->num_tqps;
+	if (hdev->num_tqps < num_vport) {
+		dev_err(&hdev->pdev->dev, "tqps(%d) is less than vports(%d)",
+			hdev->num_tqps, num_vport);
+		return -EINVAL;
+	}
 
 	/* Alloc the same number of TQPs for every vport */
 	tqp_per_vport = hdev->num_tqps / num_vport;