From: Anand Jain anand.jain@oracle.com
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@vger.kernel.org # 4.19+ Signed-off-by: Anand Jain anand.jain@oracle.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/ioctl.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2824,6 +2824,8 @@ 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;