[PATCH for-rc 3/7] RDMA/hns: Fix signed-unsigned mixed comparisons

[Junxian Huang <huangjunxian6@hisilicon.com>]

From: Chengchang Tang <tangchengchang@huawei.com>

The ib_mtu_enum_to_int() and uverbs_attr_get_len() may returns a negative
value. In this case, mixed comparisons of signed and unsigned types will
throw wrong results.

This patch adds judgement for this situation.

Fixes: 30b707886aeb ("RDMA/hns: Support inline data in extented sge space for RC")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 2b8f6489ab3d..3daa684f8836 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -270,7 +270,7 @@ static bool check_inl_data_len(struct hns_roce_qp *qp, unsigned int len)
 	struct hns_roce_dev *hr_dev = to_hr_dev(qp->ibqp.device);
 	int mtu = ib_mtu_enum_to_int(qp->path_mtu);
 
-	if (len > qp->max_inline_data || len > mtu) {
+	if (mtu < 0 || len > qp->max_inline_data || len > mtu) {
 		ibdev_err(&hr_dev->ib_dev,
 			  "invalid length of data, data len = %u, max inline len = %u, path mtu = %d.\n",
 			  len, qp->max_inline_data, mtu);
-- 
2.30.0