From: Anand Jain <anand.jain@xxxxxxxxxx> commit 013c1c5585ebcfb19c88efe79063d0463b1b6159 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: stable@xxxxxxxxxxxxxxx # 4.19+ Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/btrfs/ioctl.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2788,6 +2788,8 @@ static int btrfs_ioctl_get_subvol_info(s } } + btrfs_free_path(path); + path = NULL; if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) ret = -EFAULT;
