linux-kernel - [PATCH 4.19 160/346] RDMA/cxgb4: Validate the number of CQEs

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Date:   Mon, 28 Dec 2020 13:47:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kamal Heib <kamalheib1@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 160/346] RDMA/cxgb4: Validate the number of CQEs

From: Kamal Heib <kamalheib1@...il.com>

[ Upstream commit 6d8285e604e0221b67bd5db736921b7ddce37d00 ]

Before create CQ, make sure that the requested number of CQEs is in the
supported range.

Fixes: cfdda9d76436 ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
Link: https://lore.kernel.org/r/20201108132007.67537-1-kamalheib1@gmail.com
Signed-off-by: Kamal Heib <kamalheib1@...il.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/cxgb4/cq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index 1fd8798d91a73..beba761902449 100644
--- a/drivers/infiniband/hw/cxgb4/cq.c
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -1012,6 +1012,9 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
 
 	rhp = to_c4iw_dev(ibdev);
 
+	if (entries < 1 || entries > ibdev->attrs.max_cqe)
+		return -EINVAL;
+
 	if (vector >= rhp->rdev.lldi.nciq)
 		return ERR_PTR(-EINVAL);
 
-- 
2.27.0