linux-kernel - Re: [PATCH] audit: fix mark refcounting

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Date:	Tue, 15 Nov 2011 09:31:55 -0500
From:	Eric Paris <eparis@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] audit: fix mark refcounting

I picked it up in my audit tree for next go round, although I haven't
published the tree as I'm still doing devel...  Should be in next in a
week or two.

-Eric

On Tue, 2011-11-15 at 15:12 +0100, Miklos Szeredi wrote:
> Ping?
> 
> On Mon, Nov 7, 2011 at 3:59 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> > From: Miklos Szeredi <mszeredi@...e.cz>
> >
> > Removing the parent of a watched file results in "kernel BUG at
> > fs/notify/mark.c:139".
> >
> > To reproduce
> >
> >  add "-w /tmp/audit/dir/watched_file" to audit.rules
> >  rm -rf /tmp/audit/dir
> >
> > This is caused by fsnotify_destroy_mark() being called without an
> > extra reference taken by the caller.
> >
> > Reported by Francesco Cosoleto here:
> >
> >  https://bugzilla.novell.com/show_bug.cgi?id=689860
> >
> > Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
> > CC: Al Viro <viro@...iv.linux.org.uk>
> > CC: Eric Paris <eparis@...hat.com>
> > CC: stable@...r.kernel.org
> > ---
> >  kernel/audit_watch.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> > Index: linux.git/kernel/audit_watch.c
> > ===================================================================
> > --- linux.git.orig/kernel/audit_watch.c 2011-09-13 16:08:20.000000000 +0200
> > +++ linux.git/kernel/audit_watch.c      2011-11-07 15:19:07.000000000 +0100
> > @@ -349,7 +349,9 @@ static void audit_remove_parent_watches(
> >        }
> >        mutex_unlock(&audit_filter_mutex);
> >
> > +       audit_get_parent(parent);
> >        fsnotify_destroy_mark(&parent->mark);
> > +       audit_put_parent(parent);
> >  }
> >
> >  /* Get path information necessary for adding watches. */
> >


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