linux-kernel - Re: [PATCH 0/6] improve list

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Date:	Sat, 21 Aug 2010 12:56:13 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Don Mullis <don.mullis@...il.com>
Cc:	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH 0/6] improve list_sort test

On Sun, 2010-08-08 at 13:07 -0700, Don Mullis wrote:
> On Sun, Aug 8, 2010 at 12:31 PM, Don Mullis <don.mullis@...il.com> wrote:
> > Artem Bityutskiy <dedekind1@...il.com> writes:
> >> Actually, your 'list_sort()' version does have a problem. I found out
> >> that it calls 'cmp(priv, a, b)' with 'a = b' sometimes, and in these
> >> cases 'a' and 'b' can point to something which is not a valid element of
> >> the original list. Probably a senitel or something like that.
> 
> Looks like if the original list is a POT in length, the first callback
> from line 73 will pass a==b both pointing to the original list_head.
> Would you be able to test this fix?
> 
> --- linux-2.6.orig/lib/list_sort.c
> +++ linux-2.6/lib/list_sort.c
> @@ -70,7 +70,7 @@ static void merge_and_restore_back_links
>                  * element comparison is needed, so the client's cmp()
>                  * routine can invoke cond_resched() periodically.
>                  */
> -               (*cmp)(priv, tail, tail);
> +               (*cmp)(priv, tail->next, tail->next);

Ack, this fix works, thanks.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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