[PATCH 2/6] audit: Fix possible spurious -ENOSPC error

[Amir Goldstein]

On Thu, Jun 28, 2018 at 7:40 PM, Jan Kara <jack at suse.cz> wrote:
> When an inode is tagged with a tree, tag_chunk() checks whether there is
> audit_tree_group mark attached to the inode and adds one if not. However
> nothing protects another tag_chunk() to add the mark between we've
> checked and try to add the fsnotify mark thus resulting in an error from
> fsnotify_add_mark() and consequently an ENOSPC error from tag_chunk().
>
> Fix the problem by holding mark_mutex over the whole check-insert code
> sequence.
>
> Signed-off-by: Jan Kara <jack at suse.cz>
> ---

Never dived into the audit_tree code, but this looks sane.

Thanks,
Amir.