libusb-win32 / Patches / #16 allow zero length control transfer (without buffer)

#16 allow zero length control transfer (without buffer)

Milestone: Unstable_(example)

Status: closed

Owner: nobody

Labels: None

Priority: 1

Updated: 2021-10-14

Created: 2021-10-13

Creator: Tormod Volden

Private: No

Using for instance libusbk.dll 3.0.7.0 (the version currently installed with Zadig) a control transfer with zero length will fail (see https://github.com/libusb/libusb/issues/1006). I suspect this is due to the check on transfer_buffer_mdl in src/driver/ioctl.c since the same check for bulk transfer write is explicitly not done. The second patch changes the control transfer check to be consistent to the bulk transfer check.

The first patch just adds missing debug tags. The second patch applies on top.

I don't have the setup to rebuild and test libusb0.sys so I can only assume this is correct without verification by own testing. BTW this issue doesn't show when using the recently released libusbk.dll 3.0.8.0 because the control transfers are done differently here.

Driver error message caught with DebugView:
libusb0-sys:err [dispatch_ioctl] (null): invalid transfer request

2 Attachments

0001-ioctl-Add-dispCtlCode-tags-to-control-transfers.patch

0002-ioctl-Allow-ZLP-control-writes.patch

Discussion

Xiaofan Chen - 2021-10-13

Thanks. We no longer use Sourceforge for development. Please use github instead. Thanks.

Ref: https://github.com/mcuee/libusb-win32/issues/21

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Xiaofan Chen - 2021-10-14

status: open --> closed
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allow zero length control transfer (without buffer)

libusb-win32 is a port of libusb-0.1 under Windows

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#16 allow zero length control transfer (without buffer)

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