RDMA/hns: Add the check of the CQE size of the user space

[ Upstream commit e671f0e ]

If the CQE size of the user space is not the size supported by the
hardware, the creation of CQ should be stopped.

Fixes: 09a5f21 ("RDMA/hns: Add support for CQE in size of 64 Bytes")
Link: https://lore.kernel.org/r/20210927125557.15031-3-liangwenpeng@huawei.com
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/infiniband/hw/hns/hns_roce_cq.c

@@ -326,19 +326,30 @@ static void set_cq_param(struct hns_roce_cq *hr_cq, u32 cq_entries, int vector,
 	INIT_LIST_HEAD(&hr_cq->rq_list);
 }
 
-static void set_cqe_size(struct hns_roce_cq *hr_cq, struct ib_udata *udata,
-			 struct hns_roce_ib_create_cq *ucmd)
+static int set_cqe_size(struct hns_roce_cq *hr_cq, struct ib_udata *udata,
+			struct hns_roce_ib_create_cq *ucmd)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(hr_cq->ib_cq.device);
 
-	if (udata) {
-		if (udata->inlen >= offsetofend(typeof(*ucmd), cqe_size))
-			hr_cq->cqe_size = ucmd->cqe_size;
-		else
-			hr_cq->cqe_size = HNS_ROCE_V2_CQE_SIZE;
-	} else {
+	if (!udata) {
 		hr_cq->cqe_size = hr_dev->caps.cqe_sz;
+		return 0;
+	}
+
+	if (udata->inlen >= offsetofend(typeof(*ucmd), cqe_size)) {
+		if (ucmd->cqe_size != HNS_ROCE_V2_CQE_SIZE &&
+		    ucmd->cqe_size != HNS_ROCE_V3_CQE_SIZE) {
+			ibdev_err(&hr_dev->ib_dev,
+				  "invalid cqe size %u.\n", ucmd->cqe_size);
+			return -EINVAL;
+		}
+
+		hr_cq->cqe_size = ucmd->cqe_size;
+	} else {
+		hr_cq->cqe_size = HNS_ROCE_V2_CQE_SIZE;
 	}
+
+	return 0;
 }
 
 int hns_roce_create_cq(struct ib_cq *ib_cq, const struct ib_cq_init_attr *attr,
@@ -366,7 +377,9 @@ int hns_roce_create_cq(struct ib_cq *ib_cq, const struct ib_cq_init_attr *attr,
 
 	set_cq_param(hr_cq, attr->cqe, attr->comp_vector, &ucmd);
 
-	set_cqe_size(hr_cq, udata, &ucmd);
+	ret = set_cqe_size(hr_cq, udata, &ucmd);
+	if (ret)
+		return ret;
 
 	ret = alloc_cq_buf(hr_dev, hr_cq, udata, ucmd.buf_addr);
 	if (ret) {