CC+= Alex to pull this change.
Reviewed by: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Thanks,
Kirti
On 1/7/2017 11:57 AM, Dan Carpenter wrote:
> The copy_to_user() function returns the number of bytes which it wasn't
> able to copy but we want to return a negative error code.
>
> Fixes: 9d1a546c53b4 ("docs: Sample driver to demonstrate how to use Mediated device framework.")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
> index 919c10d5b12e..d2656ff569c1 100644
> --- a/samples/vfio-mdev/mtty.c
> +++ b/samples/vfio-mdev/mtty.c
> @@ -1180,7 +1180,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
>
> memcpy(&mdev_state->dev_info, &info, sizeof(info));
>
> - return copy_to_user((void __user *)arg, &info, minsz);
> + if (copy_to_user((void __user *)arg, &info, minsz))
> + return -EFAULT;
> +
> + return 0;
> }
> case VFIO_DEVICE_GET_REGION_INFO:
> {
> @@ -1201,7 +1204,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
> if (ret)
> return ret;
>
> - return copy_to_user((void __user *)arg, &info, minsz);
> + if (copy_to_user((void __user *)arg, &info, minsz))
> + return -EFAULT;
> +
> + return 0;
> }
>
> case VFIO_DEVICE_GET_IRQ_INFO:
> @@ -1224,7 +1230,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
> if (info.count == -1)
> return -EINVAL;
>
> - return copy_to_user((void __user *)arg, &info, minsz);
> + if (copy_to_user((void __user *)arg, &info, minsz))
> + return -EFAULT;
> +
> + return 0;
> }
> case VFIO_DEVICE_SET_IRQS:
> {
>
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