[PATCH 6.12 038/156] RDMA/hns: Fix accessing invalid dip_ctx during destroying QP

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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

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

From: Chengchang Tang <tangchengchang@huawei.com>

[ Upstream commit 0572eccf239ce4bd89bd531767ec5ab20e249290 ]

If it fails to modify QP to RTR, dip_ctx will not be attached. And
during detroying QP, the invalid dip_ctx pointer will be accessed.

Fixes: faa62440a577 ("RDMA/hns: Fix different dgids mapping to the same dip_idx")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20241220055249.146943-3-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 697b17cca02e..6dddadb90e02 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -5619,6 +5619,9 @@ static void put_dip_ctx_idx(struct hns_roce_dev *hr_dev,
 {
 	struct hns_roce_dip *hr_dip = hr_qp->dip;
 
+	if (!hr_dip)
+		return;
+
 	xa_lock(&hr_dev->qp_table.dip_xa);
 
 	hr_dip->qp_cnt--;
-- 
2.39.5