linux-kernel - [PATCH 0/3] media: fix zero-length USB control requests

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Message-Id: <20210524110920.24599-1-johan@kernel.org>
Date:   Mon, 24 May 2021 13:09:17 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 0/3] media: fix zero-length USB control requests

The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.

Control transfers without a data stage are treated as OUT requests by
the USB stack and should be using usb_sndctrlpipe(). Failing to do so
will now trigger a warning.

This series fixes the three media drivers that got this wrong.

Johan

Johan Hovold (3):
  media: gspca/gl860: fix zero-length control requests
  media: gspca/sunplus: fix zero-length control requests
  media: rtl28xxu: fix zero-length control request

 drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 3 ++-
 drivers/media/usb/gspca/gl860/gl860.c   | 4 ++--
 drivers/media/usb/gspca/sunplus.c       | 8 ++++++--
 3 files changed, 10 insertions(+), 5 deletions(-)

-- 
2.26.3