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Message-Id: <20210715182652.248759867@linuxfoundation.org>
Date: Thu, 15 Jul 2021 20:40:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
syzbot+faf11bbadc5a372564da@...kaller.appspotmail.com,
Antti Palosaari <crope@....fi>,
Johan Hovold <johan@...nel.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 5.13 252/266] media: rtl28xxu: fix zero-length control request
From: Johan Hovold <johan@...nel.org>
commit 25d5ce3a606a1eb23a9265d615a92a876ff9cb5f upstream.
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.
Fix the zero-length i2c-read request used for type detection by
attempting to read a single byte instead.
Reported-by: syzbot+faf11bbadc5a372564da@...kaller.appspotmail.com
Fixes: d0f232e823af ("[media] rtl28xxu: add heuristic to detect chip type")
Cc: stable@...r.kernel.org # 4.0
Cc: Antti Palosaari <crope@....fi>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -612,8 +612,9 @@ static int rtl28xxu_read_config(struct d
static int rtl28xxu_identify_state(struct dvb_usb_device *d, const char **name)
{
struct rtl28xxu_dev *dev = d_to_priv(d);
+ u8 buf[1];
int ret;
- struct rtl28xxu_req req_demod_i2c = {0x0020, CMD_I2C_DA_RD, 0, NULL};
+ struct rtl28xxu_req req_demod_i2c = {0x0020, CMD_I2C_DA_RD, 1, buf};
dev_dbg(&d->intf->dev, "\n");
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