When sending error messages, set the length properly.

datapath/forward.c

@@ -349,7 +349,7 @@ recv_vendor(struct sw_chain *chain, const struct sender *sender,
 		if (net_ratelimit())
 			printk("Uknown vendor: %#x\n", ntohl(ovh->vendor));
 		dp_send_error_msg(chain->dp, sender, OFPET_BAD_REQUEST,
-				  OFPBRC_BAD_VENDOR, msg, ovh->header.length);
+				  OFPBRC_BAD_VENDOR, msg, ntohs(ovh->header.length));
 		return -EINVAL;
 	}
 }

datapath/nx_msg.c

@@ -33,7 +33,7 @@ nx_recv_msg(struct sw_chain *chain, const struct sender *sender,
 
 	default:
 		dp_send_error_msg(chain->dp, sender, OFPET_BAD_REQUEST,
-				  OFPBRC_BAD_SUBTYPE, msg, nh->header.length);
+				  OFPBRC_BAD_SUBTYPE, msg, ntohs(nh->header.length));
 		return -EINVAL;
 	}