[PATCH 5.4 144/155] media: usbtv: fix control-message timeouts

Greg Kroah-Hartman
2020-03-31T09:19:00Z

From: Johan Hovold <johan@kernel.org>

commit 536f561d871c5781bc33d26d415685211b94032e upstream.

The driver was issuing synchronous uninterruptible control requests
without using a timeout. This could lead to the driver hanging on
various user requests due to a malfunctioning (or malicious) device
until the device is physically disconnected.

The USB upper limit of five seconds per request should be more than
enough.

Fixes: f3d27f34fdd7 ("[media] usbtv: Add driver for Fushicai USBTV007 video frame grabber")
Fixes: c53a846c48f2 ("[media] usbtv: add video controls")
Cc: stable <stable@vger.kernel.org> # 3.11
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/media/usb/usbtv/usbtv-core.c | 2 +-
drivers/media/usb/usbtv/usbtv-video.c | 5 +++--
2 files changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/media/usb/usbtv/usbtv-core.c
+++ b/drivers/media/usb/usbtv/usbtv-core.c
@@ -56,7 +56,7 @@ int usbtv_set_regs(struct usbtv *usbtv,

ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- value, index, NULL, 0, 0);
+ value, index, NULL, 0, USB_CTRL_GET_TIMEOUT);
if (ret < 0)
return ret;
}
--- a/drivers/media/usb/usbtv/usbtv-video.c
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -800,7 +800,8 @@ static int usbtv_s_ctrl(struct v4l2_ctrl
ret = usb_control_msg(usbtv->udev,
usb_rcvctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- 0, USBTV_BASE + 0x0244, (void *)data, 3, 0);
+ 0, USBTV_BASE + 0x0244, (void *)data, 3,
+ USB_CTRL_GET_TIMEOUT);
if (ret < 0)
goto error;
}
@@ -851,7 +852,7 @@ static int usbtv_s_ctrl(struct v4l2_ctrl
ret = usb_control_msg(usbtv->udev, usb_sndctrlpipe(usbtv->udev, 0),
USBTV_CONTROL_REG,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- 0, index, (void *)data, size, 0);
+ 0, index, (void *)data, size, USB_CTRL_SET_TIMEOUT);

error:
if (ret < 0)