From 536f561d871c5781bc33d26d415685211b94032e Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Mon, 13 Jan 2020 18:18:18 +0100
Subject: [PATCH] media: usbtv: fix control-message timeouts
Git-commit: 536f561d871c5781bc33d26d415685211b94032e
Patch-mainline: v5.7-rc1
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

diff --git a/drivers/media/usb/usbtv/usbtv-core.c b/drivers/media/usb/usbtv/usbtv-core.c
index 5095c380b2c1..ee9c656d121f 100644
--- 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, 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;
 	}
diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
index 3d9284a09ee5..b249f037900c 100644
--- 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 *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)
-- 
2.16.4