btrfs: free btrfs_path before copying subvol info to userspace

commit 013c1c5 upstream.

btrfs_ioctl_get_subvol_info() frees the search path after the userspace
copy from the temp buffer @subvol_info. This can lead to a lock splat
warning.

Fix this by freeing the path before we copy it to userspace.

CC: [email protected] # 4.19+
Signed-off-by: Anand Jain <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: asj

fs/btrfs/ioctl.c

@@ -2788,6 +2788,8 @@ static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
 		}
 	}
 
+	btrfs_free_path(path);
+	path = NULL;
 	if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
 		ret = -EFAULT;