[patch 3/3] vfio: return -EFAULT on failure

[Dan Carpenter]

This ioctl function is supposed to return a negative error code or zero
on success.  copy_to_user() returns zero or the number of bytes
remaining to be copied.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 457acf3..1aa373f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1159,6 +1159,8 @@ static long vfio_group_fops_unl_ioctl(struct file *filep,
                        status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET;
 
                ret = copy_to_user((void __user *)arg, &status, minsz);
+               if (ret)
+                       ret = -EFAULT;
 
                break;
        }
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