On Tue, Nov 15, 2022 at 02:47:31PM -0700, Peter Gonda wrote:
> > > + * certificate data buffer retry the same guest request without the
> > > + * extended data request.
> > > + */
> > > + if (exit_code == SVM_VMGEXIT_EXT_GUEST_REQUEST &&
> > > + err == SNP_GUEST_REQ_INVALID_LEN) {
> > > + const unsigned int certs_npages = snp_dev->input.data_npages;
> > > +
> > > + exit_code = SVM_VMGEXIT_GUEST_REQUEST;
> > > + rc = snp_issue_guest_request(exit_code, &snp_dev->input, &err);
> > > +
> > > + err = SNP_GUEST_REQ_INVALID_LEN;
> >
> > Huh, why are we overwriting err here?
>
> I have added a comment for the next revision.
>
> We are overwriting err here so that userspace is alerted that they
> supplied a buffer too small.
Sure but you're not checking rc either. What if that reissue fails for
whatever other reason? -EIO for example...
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Martje Boudien Moerman
(HRB 36809, AG Nürnberg)
