diff mbox series

[v3,3/6] soc: hisilicon: kunpeng_hccs: Add the check for base address and size of shared memory

Message ID 20240828104956.20214-4-lihuisong@huawei.com (mailing list archive)
State New, archived
Headers show
Series Add some features and bugfix for kunpeng_hccs | expand

Commit Message

Huisong Li Aug. 28, 2024, 10:49 a.m. UTC 
If the shmem_base_addr from PCCT is zero, hccs_register_pcc_channel will
return success. And then driver will access to illegal address when send
PCC command. In addition, the size of shared memory used for communication
between driver and platform is fixed, namely 64 Bytes which is
unchangeable. So add the verification for hardening code.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/soc/hisilicon/kunpeng_hccs.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/drivers/soc/hisilicon/kunpeng_hccs.c b/drivers/soc/hisilicon/kunpeng_hccs.c
index 6e88f597f267..6055e5091cbd 100644
--- a/drivers/soc/hisilicon/kunpeng_hccs.c
+++ b/drivers/soc/hisilicon/kunpeng_hccs.c
@@ -170,15 +170,21 @@  static int hccs_register_pcc_channel(struct hccs_dev *hdev)
 		goto err_mbx_channel_free;
 	}
 
-	if (pcc_chan->shmem_base_addr) {
-		cl_info->pcc_comm_addr = ioremap(pcc_chan->shmem_base_addr,
-						 pcc_chan->shmem_size);
-		if (!cl_info->pcc_comm_addr) {
-			dev_err(dev, "Failed to ioremap PCC communication region for channel-%u.\n",
-				hdev->chan_id);
-			rc = -ENOMEM;
-			goto err_mbx_channel_free;
-		}
+	if (!pcc_chan->shmem_base_addr ||
+	    pcc_chan->shmem_size != HCCS_PCC_SHARE_MEM_BYTES) {
+		dev_err(dev, "The base address or size (%llu) of PCC communication region is invalid.\n",
+			pcc_chan->shmem_size);
+		rc = -EINVAL;
+		goto err_mbx_channel_free;
+	}
+
+	cl_info->pcc_comm_addr = ioremap(pcc_chan->shmem_base_addr,
+					 pcc_chan->shmem_size);
+	if (!cl_info->pcc_comm_addr) {
+		dev_err(dev, "Failed to ioremap PCC communication region for channel-%u.\n",
+			hdev->chan_id);
+		rc = -ENOMEM;
+		goto err_mbx_channel_free;
 	}
 
 	return 0;