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hw/usb/canokey: Fix CCID ZLP 

CCID could send zero-length packet (ZLP)
if we invoke two data_in, two packets would be concated
and we could not distinguish them.

The CANOKEY_EMU_EP_CTAPHID is imported from canokey-qemu.h

Reported-by: MkfsSion <myychina28759@gmail.com>
Signed-off-by: Hongren (Zenithal) Zheng <i@zenithal.me>
Message-Id: <YqcqGz0s3+LE42ms@Sun>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hongren (Zenithal) Zheng 2022-06-13 20:14:19 +08:00 committed by Gerd Hoffmann
parent 8c0d80245f
commit ada270cd18
1 changed files with 3 additions and 4 deletions
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7
hw/usb/canokey.c
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@ -109,11 +109,10 @@ int canokey_emu_transmit(
* Note: this is a quirk for CanoKey CTAPHID
* because it calls multiple emu_transmit in one device_loop
* but w/o data_in it would stuck in device_loop
* This has no side effect for CCID as it is strictly
* OUT then IN transfer
* However it has side effect for Control transfer
* This has side effect for CCID since CCID can send ZLP
* This also has side effect for Control transfer
*/
if (ep_in != 0) {
if (ep_in == CANOKEY_EMU_EP_CTAPHID) {
canokey_emu_data_in(ep_in);
}
return 0;