net: hns3: add validity check for message data length

Add validity check for message data length in function
hclge_send_mbx_msg(), avoid unexpected overflow.

Fixes: dde1a86e93ca ("net: hns3: Add mailbox support to PF driver")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
index 36cbafc..53f9399 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -94,6 +94,13 @@ static int hclge_send_mbx_msg(struct hclge_vport *vport, u8 *msg, u16 msg_len,
        enum hclge_comm_cmd_status status;
        struct hclge_desc desc;
 
+       if (msg_len > HCLGE_MBX_MAX_MSG_SIZE) {
+               dev_err(&hdev->pdev->dev,
+                       "msg data length(=%u) exceeds maximum(=%u)\n",
+                       msg_len, HCLGE_MBX_MAX_MSG_SIZE);
+               return -EMSGSIZE;
+       }
+
        resp_pf_to_vf = (struct hclge_mbx_pf_to_vf_cmd *)desc.data;
 
        hclge_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_PF_TO_VF, false);