net: hns3: add checking for vf id of mailbox

Add checking for vf id of mailbox, in order to avoid array
out-of-bounds risk.
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c

@@ -1123,10 +1123,11 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 		req = (struct hclge_mbx_vf_to_pf_cmd *)desc->data;
 
 		flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
-		if (unlikely(!hnae3_get_bit(flag, HCLGE_CMDQ_RX_OUTVLD_B))) {
+		if (unlikely(!hnae3_get_bit(flag, HCLGE_CMDQ_RX_OUTVLD_B) ||
+			     req->mbx_src_vfid > hdev->num_req_vfs)) {
 			dev_warn(&hdev->pdev->dev,
-				 "dropped invalid mailbox message, code = %u\n",
-				 req->msg.code);
+				 "dropped invalid mailbox message, code = %u, vfid = %u\n",
+				 req->msg.code, req->mbx_src_vfid);
 
 			/* dropping/not processing this invalid message */
 			crq->desc[crq->next_to_use].flag = 0;