s390/cio: return -EFAULT if copy_to_user() fails

commit d9c48a948d29bcb22f4fe61a81b718ef6de561a0 upstream.

Fixes: 120e214e504f ("vfio: ccw: realize VFIO_DEVICE_G(S)ET_IRQ_INFO ioctls")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 3222a6a450964fbed9beb880d372221613f2669a..672362ee479c4cd8eda2fe828b80bb9a69a9140b 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -383,7 +383,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
                if (info.count == -1)
                        return -EINVAL;
 
-               return copy_to_user((void __user *)arg, &info, minsz);
+               return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
        }
        case VFIO_DEVICE_SET_IRQS:
        {