[PATCH v2 for-rc 4/8] RDMA/hns: Fix missing pagesize and alignment check in FRMR

[Junxian Huang]

From: Chengchang Tang <tangchengchang@xxxxxxxxxx>

The offset requires 128B alignment and the page size ranges from
4K to 128M.

Fixes: 68a997c5d28c ("RDMA/hns: Add FRMR support for hip08")
Signed-off-by: Chengchang Tang <tangchengchang@xxxxxxxxxx>
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
 drivers/infiniband/hw/hns/hns_roce_device.h | 4 ++++
 drivers/infiniband/hw/hns/hns_roce_mr.c     | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index f8451e5ab107..7d5931872f8a 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -83,6 +83,7 @@
 #define MR_TYPE_DMA				0x03
 
 #define HNS_ROCE_FRMR_MAX_PA			512
+#define HNS_ROCE_FRMR_ALIGN_SIZE		128
 
 #define PKEY_ID					0xffff
 #define NODE_DESC_SIZE				64
@@ -189,6 +190,9 @@ enum {
 #define HNS_HW_PAGE_SHIFT			12
 #define HNS_HW_PAGE_SIZE			(1 << HNS_HW_PAGE_SHIFT)
 
+#define HNS_HW_MAX_PAGE_SHIFT			27
+#define HNS_HW_MAX_PAGE_SIZE			(1 << HNS_HW_MAX_PAGE_SHIFT)
+
 struct hns_roce_uar {
 	u64		pfn;
 	unsigned long	index;
diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index 1a61dceb3319..846da8c78b8b 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -443,6 +443,11 @@ int hns_roce_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
 	struct hns_roce_mtr *mtr = &mr->pbl_mtr;
 	int ret, sg_num = 0;
 
+	if (!IS_ALIGNED(*sg_offset, HNS_ROCE_FRMR_ALIGN_SIZE) ||
+	    ibmr->page_size < HNS_HW_PAGE_SIZE ||
+	    ibmr->page_size > HNS_HW_MAX_PAGE_SIZE)
+		return sg_num;
+
 	mr->npages = 0;
 	mr->page_list = kvcalloc(mr->pbl_mtr.hem_cfg.buf_pg_count,
 				 sizeof(dma_addr_t), GFP_KERNEL);
-- 
2.33.0