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Commit 56be9f1b authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Greg Kroah-Hartman
Browse files

media: uvcvideo: Fix error path in control parsing failure 



commit 8c279e9394cade640ed86ec6c6645a0e7df5e0b6 upstream.

When parsing the UVC control descriptors fails, the error path tries to
cleanup a media device that hasn't been initialised, potentially
resulting in a crash. Fix this by initialising the media device before
the error handling path can be reached.

Fixes: 5a254d75 ("[media] uvcvideo: Register a v4l2_device")
Reported-by: default avatar <syzbot+c86454eb3af9e8a4da20@syzkaller.appspotmail.com>
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 61e73cf5

drivers/media/usb/uvc/uvc_driver.c

+15 −13
Original line number Diff line number Diff line
@@ -2124,6 +2124,20 @@ static int uvc_probe(struct usb_interface *intf, 
			   sizeof(dev->name) - len);

	}



	/* Initialize the media device. */

#ifdef CONFIG_MEDIA_CONTROLLER

	dev->mdev.dev = &intf->dev;

	strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));

	if (udev->serial)

		strscpy(dev->mdev.serial, udev->serial,

			sizeof(dev->mdev.serial));

	usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));

	dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);

	media_device_init(&dev->mdev);



	dev->vdev.mdev = &dev->mdev;

#endif



	/* Parse the Video Class control descriptor. */

	if (uvc_parse_control(dev) < 0) {

		uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
@@ -2144,19 +2158,7 @@ static int uvc_probe(struct usb_interface *intf, 
			"linux-uvc-devel mailing list.\n");

	}



	/* Initialize the media device and register the V4L2 device. */

#ifdef CONFIG_MEDIA_CONTROLLER

	dev->mdev.dev = &intf->dev;

	strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));

	if (udev->serial)

		strlcpy(dev->mdev.serial, udev->serial,

			sizeof(dev->mdev.serial));

	strcpy(dev->mdev.bus_info, udev->devpath);

	dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);

	media_device_init(&dev->mdev);



	dev->vdev.mdev = &dev->mdev;

#endif

	/* Register the V4L2 device. */

	if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)

		goto error;