On Wed, Nov 27, 2019 at 02:12:58PM +0100, Jan Kara wrote:
> Function ext4_empty_dir() doesn't correctly handle directories with
> holes and crashes on bh->b_data dereference when bh is NULL. Reorganize
> the loop to use 'offset' variable all the times instead of comparing
> pointers to current direntry with bh->b_data pointer. Also add more
> strict checking of '.' and '..' directory entries to avoid entering loop
> in possibly invalid state on corrupted filesystems.
>
> References: CVE-2019-19037
> CC: stable@xxxxxxxxxxxxxxx
> Fixes: 4e19d6b65fb4 ("ext4: allow directory holes")
> Signed-off-by: Jan Kara <jack@xxxxxxx>
Thanks, applied.
- Ted
