mirrors/hekate
1
0
Fork 0
mirror of https://github.com/CTCaer/hekate.git synced 2024-11-09 12:01:45 +00:00
Code Issues Releases Activity

ums/xusb: do not allow multiple CBW requests

Browse source 
On XUSB do not allow multiple requests for CBW to be done.
This avoids an issue with some XHCI controllers and OS combos (e.g. ASMedia and Linux/Mac OS) which confuse that and concatenate an old CBW request with another write request (SCSI Write) and create a babble error (transmit overflow).
This commit is contained in:
CTCaer 2021-08-28 17:09:38 +03:00
parent 134f3dac52
commit 4b7e1f699d
1 changed files with 19 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
bdk/usb/usb_gadget_ums.c
View file

@ -217,6 +217,7 @@ typedef struct _usbd_gadget_ums_t {
u32 tag;
u32 residue;
u32 usb_amount_left;
bool cbw_req_queued;
u32 phase_error;
u32 short_packet_received;
@ -1578,6 +1579,8 @@ static int received_cbw(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
{
ums->set_text(ums->label, "#C7EA46 Status:# Medium unmounted");
ums->timeouts++;
if (!bulk_ctxt->bulk_out_status)
ums->timeouts += 3;
}
if (ums->timeouts > 20)
@ -1588,6 +1591,9 @@ static int received_cbw(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
return UMS_RES_INVALID_ARG;
}
// Clear request flag to allow a new one to be queued.
ums->cbw_req_queued = false;
// Is the CBW valid?
bulk_recv_pkt_t *cbw = (bulk_recv_pkt_t *)bulk_ctxt->bulk_out_buf;
if (bulk_ctxt->bulk_out_length_actual != USB_BULK_CB_WRAP_LEN || cbw->Signature != USB_BULK_CB_SIG)
@ -1665,7 +1671,19 @@ static int get_next_command(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
bulk_ctxt->bulk_out_length = USB_BULK_CB_WRAP_LEN;
// Queue a request to read a Bulk-only CBW.
_ums_transfer_start(ums, bulk_ctxt, bulk_ctxt->bulk_out, USB_XFER_SYNCED_CMD);
if (!ums->cbw_req_queued)
_ums_transfer_start(ums, bulk_ctxt, bulk_ctxt->bulk_out, USB_XFER_SYNCED_CMD);
else
_ums_transfer_finish(ums, bulk_ctxt, bulk_ctxt->bulk_out, USB_XFER_SYNCED_CMD);
/*
* On XUSB do not allow multiple requests for CBW to be done.
* This avoids an issue with some XHCI controllers and OS combos (e.g. ASMedia and Linux/Mac OS)
* which confuse that and concatenate an old CBW request with another write request (SCSI Write)
* and create a babble error (transmit overflow).
*/
if (ums->xusb)
ums->cbw_req_queued = true;
/* We will drain the buffer in software, which means we
* can reuse it for the next filling. No need to advance