[PATCH] nvme-auth: update sc_c in host response

[Martin George]

On Mon, 2025-09-08 at 14:49 +0200, Hannes Reinecke wrote:
> On 9/8/25 13:26, Martin George wrote:
> > The sc_c field is currently not updated in the host response to the
> > controller challenge leading to failures while attempting secure
> > channel concatenation. Fix this by adding a new sc_c variable to
> > the
> > dhchap queue context structure which is appropriately set during
> > negotiate and then used in the host response.
> > 
> > Fixes: e88a7595b57f ("nvme-tcp: request secure channel
> > concatenation")
> > Signed-off-by: Martin George <marting at netapp.com>
> > Signed-off-by: Prashanth Adurthi <prashana at netapp.com>
> > ---
> >   drivers/nvme/host/auth.c | 6 +++++-
> >   1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
> > index 201fc8809a62..a7344faab2b2 100644
> > --- a/drivers/nvme/host/auth.c
> > +++ b/drivers/nvme/host/auth.c
> > @@ -36,6 +36,7 @@ struct nvme_dhchap_queue_context {
> >   	u8 status;
> >   	u8 dhgroup_id;
> >   	u8 hash_id;
> > +	u8 sc_c;
> >   	size_t hash_len;
> >   	u8 c1[64];
> >   	u8 c2[64];
> > @@ -154,6 +155,8 @@ static int
> > nvme_auth_set_dhchap_negotiate_data(struct nvme_ctrl *ctrl,
> >   	data->auth_protocol[0].dhchap.idlist[34] =
> > NVME_AUTH_DHGROUP_6144;
> >   	data->auth_protocol[0].dhchap.idlist[35] =
> > NVME_AUTH_DHGROUP_8192;
> >   
> > +	chap->sc_c = data->sc_c;
> > +
> >   	return size;
> >   }
> >   
> > @@ -488,7 +491,7 @@ static int
> > nvme_auth_dhchap_setup_host_response(struct nvme_ctrl *ctrl,
> >   	ret = crypto_shash_update(shash, buf, 2);
> >   	if (ret)
> >   		goto out;
> > -	memset(buf, 0, sizeof(buf));
> > +	memset(buf, chap->sc_c, sizeof(buf));
> 
> 'sc_c' is just a single byte, please do
> 
> *buf = chap->sc_c;
> 
> Otherwise both bytes in 'buf' are being set to 'sc_c'.
> 

Sure, will send a v2 of the patch with this change. Thanks.

-Martin
>