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media: usbtv: fix control-message timeouts 

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: f3d27f34fd ("[media] usbtv: Add driver for Fushicai USBTV007 video frame grabber")
Fixes: c53a846c48 ("[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>
This commit is contained in:
Johan Hovold 2020-01-13 18:18:18 +01:00 committed by Mauro Carvalho Chehab
parent b36be08f20
commit 536f561d87
2 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/usb/usbtv/usbtv-core.c
View File

@ -56,7 +56,7 @@ int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
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;
}

5
drivers/media/usb/usbtv/usbtv-video.c
View File

@ -800,7 +800,8 @@ static int usbtv_s_ctrl(struct v4l2_ctrl *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 *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)