From: Domen Puncer <domen@coderock.org>
To: intermezzo-devel@lists.sourceforge.net
Subject: replicator.c - bug in izo_rep_cache_clean()?
Date: Mon, 29 Sep 2003 19:34:39 +0200
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Hi.

Another repost after more than a month, since this bug is still in kernel tree.
Now CC-ing lkml, folks at intermezzo ml don't care?

I've been doing some janitor work and came across this:


On Saturday 12 of July 2003 18:07, Matthew Wilcox wrote:
> On Sat, Jul 12, 2003 at 05:22:55PM +0200, Domen Puncer wrote:
> > ---
> > fs/intermezzo/replicator.c:83: //izo_rep_cache_clean()
> >                 tmp = bucket = &fset->fset_clients[i];
> >
> >                 tmp = tmp->next;
> >                 while (tmp != bucket) {
> >                         struct izo_offset_rec *offrec;
> >                         tmp = tmp->next;
> >                         list_del(tmp);
> >                         offrec = list_entry(tmp, struct izo_offset_rec,
> >                                             or_list);
> >                         PRESTO_FREE(offrec, sizeof(struct
> > izo_offset_rec)); }
> >
> > This code just doesn't look right.
> > We delete tmp (tmp->next = LIST_POISON1)... next time we'll
> >  list_del(LIST_POISON1)!!
> > We also do not delete first entry in the list
> > &fset->fset_clients[i]->next.
>
> Yup, looks like a bug.  I bet they meant to list_del(&tmp->prev).

I guess it could be written like this:
	list_for_each_save(tmp, next, bucket) {
		struct izo_offset_rec *offrec;
		list_del(tmp);
		...


	Domen
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