Attention is currently required from: Hoernchen, dexter, jolly, lynxis lazus.

laforge has posted comments on this change by laforge. ( https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/42192?usp=email )

Change subject: ccid_device: Reject XfrBlock with zero-length data ......................................................................

Patch Set 1:

(1 comment)

Patchset:

PS1:

I don't have a strong opinion. […]

@jolly just tested with a Omnikey 6121, which apparently actually transmits it to the card and gets a R-APDU 6881 from the card. So it doesn't reject it at the CCID layer but lets the card respond, in this case with the somewhat odd "Logical channel not supported" status word.

I still think it's fine to reject it at the CCID level. In any case, rejecting it is better than running into a crash or assert.