linux-kernel - Re: [BUG] SLOB's krealloc() seems bust

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Message-Id: <1223395846.26330.55.camel@lappy.programming.kicks-ass.net>
Date:	Tue, 07 Oct 2008 18:10:45 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] SLOB's krealloc() seems bust

On Tue, 2008-10-07 at 10:00 -0500, Matt Mackall wrote:
> Give this a try, please:
> 
> diff -r 5e32b09a1b2b mm/slob.c
> --- a/mm/slob.c Fri Oct 03 14:04:43 2008 -0500
> +++ b/mm/slob.c Tue Oct 07 10:00:16 2008 -0500
> @@ -515,7 +515,7 @@
>  
>         sp = (struct slob_page *)virt_to_page(block);
>         if (slob_page(sp))
> -               return ((slob_t *)block - 1)->units + SLOB_UNIT;
> +               return (((slob_t *)block - 1)->units - 1) * SLOB_UNIT;
>         else
>                 return sp->page.private;
>  }

That seems to make it work again! (4 reboots, 0 crashes)

Tested-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Thanks!

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