| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 74/91] media: usbtv: fix control-message timeouts | Date | Wed, 1 Apr 2020 18:18:10 +0200 |
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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 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/usb/usbtv/usbtv-core.c +++ b/drivers/media/usb/usbtv/usbtv-core.c @@ -42,7 +42,7 @@ 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; }
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