Re: [Qemu-devel] [Qemu-block] [PATCH v3 11/18] qcow2: convert QCow2 to use QCryptoBlock for encryption

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Feb 08, 2017 at 05:15:34PM +0100, Alberto Garcia wrote:
> On Thu 26 Jan 2017 11:18:20 AM CET, "Daniel P. Berrange" <berrange@redhat.com> wrote:
> 
> > @@ -751,6 +757,23 @@ static int qcow2_update_options_prepare(BlockDriverState *bs,
> >      r->discard_passthrough[QCOW2_DISCARD_OTHER] =
> >          qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false);
> >  
> > +    switch (s->crypt_method_header) {
> > +    case QCOW_CRYPT_NONE:
> > +        break;
> > +
> > +    case QCOW_CRYPT_AES:
> > +        r->crypto_opts = block_crypto_open_opts_init(
> > +            Q_CRYPTO_BLOCK_FORMAT_QCOW, opts, "aes-", errp);
> > +        break;
> > +
> > +    default:
> > +        g_assert_not_reached();
> 
> This crashes QEMU if the qcow2 file uses an different method (or is
> corrupted).
> 
> > +    }
> > +    if (s->crypt_method_header && !r->crypto_opts) {
> > +        ret = -EINVAL;
> > +        goto fail;
> > +    }
> 
> Shouldn't you remove the assertion and set errp here to "Unsupported
> encryption method" instead?

Yep, I think this was left over from an earlier version of the patch
series where I had already validated crypto_method_header.

Regards,
Daniel
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