CSR generation does not return an error when generating an invalid subject

[RonEld]

Description

• Type: Bug
• Priority: Minor

As reported in the forum

---

Bug

mbed TLS build:
Version: git commit id 252faff

Version:

Expected behavior
CSR generation should return a failure, because the subject is not a valid DN, and the generated CSR is invalid

Actual behavior
CSR generation succeeds. ( later CSR parsing fails)

Steps to reproduce

./cert_req filename=private_key-2.pem subject_name=dannybackx.hopto.org
  . Seeding the random number generator... ok
  . Checking subject name... ok
  . Loading the private key ... ok
  . Writing the certificate request ... ok
acer: {52} ./req_app

  . Loading the CSR ... failed
  !  mbedtls_x509_csr_parse_file returned -9184

[RonEld]

Note that the cert_req help message shows a valid subject_name so I would consider the priority of this issue as Minor, however I would still expect an error being raised in this case