[PATCH net-next 9/9] net: hns3: set maximum length to resp_data_len for exceptional case

From: Huazhong Tan
Date: Thu Jul 04 2019 - 10:06:37 EST


From: Peng Li <lipeng321@xxxxxxxxxx>

If HCLGE_MBX_MAX_RESP_DATA_SIZE > HCLGE_MBX_MAX_RESP_DATA_SIZE,
the memcpy will cause out of memory. So this patch just set
resp_data_len to the maximum length for this case.

Signed-off-by: Peng Li <lipeng321@xxxxxxxxxx>
Signed-off-by: Huazhong Tan <tanhuazhong@xxxxxxxxxx>
---
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
index 9adeba9..a38ac7c 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -29,6 +29,10 @@ static int hclge_gen_resp_to_vf(struct hclge_vport *vport,
"PF fail to gen resp to VF len %d exceeds max len %d\n",
resp_data_len,
HCLGE_MBX_MAX_RESP_DATA_SIZE);
+ /* If resp_data_len is too long, set the value to max length
+ * and return the msg to VF
+ */
+ resp_data_len = HCLGE_MBX_MAX_RESP_DATA_SIZE;
}

hclge_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_PF_TO_VF, false);
--
2.7.4