This is a note to let you know that I've just added the patch titled
media: rtl28xxu: fix zero-length control request
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-rtl28xxu-fix-zero-length-control-request.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 25d5ce3a606a1eb23a9265d615a92a876ff9cb5f Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Mon, 24 May 2021 13:09:20 +0200
Subject: media: rtl28xxu: fix zero-length control request
From: Johan Hovold <johan@xxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: d0f232e823af ("[media] rtl28xxu: add heuristic to detect chip type")
Cc: stable@xxxxxxxxxxxxxxx # 4.0
Cc: Antti Palosaari <crope@xxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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");
Patches currently in stable-queue which might be from johan@xxxxxxxxxx are
queue-5.13/media-gspca-sq905-fix-control-request-direction.patch
queue-5.13/media-gspca-sunplus-fix-zero-length-control-requests.patch
queue-5.13/media-rtl28xxu-fix-zero-length-control-request.patch
queue-5.13/media-dtv5100-fix-control-request-directions.patch
