Hi Haiyang,

[I'm resuming this work by Andres.  Sorry for the delay.]

quoted

 	switch (nvsp_packet->hdr.msg_type) {
 	case NVSP_MSG_TYPE_INIT_COMPLETE:
 	case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
 	case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
 	case NVSP_MSG5_TYPE_SUBCHANNEL:
+		if (msglen < sizeof(struct nvsp_message)) {
+			netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
+				   msglen);
+			return;
+		}

struct nvsp_message includes all message types, so its length is the longest type,
The messages from older host version are not necessarily reaching the 
sizeof(struct nvsp_message).

I split the check above into several checks, one for each "case", using
(what I understand are) the corresponding structures/sizeofs...

Testing on both new and older hosts are recommended, in case I didn't find out all issues
like this one.

Sure, will do.

Thanks,
  Andrea