linux-kernel - Re: [patch] sh: off by one BUG_ON() in setup_bootmem

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Date:	Thu, 4 Dec 2014 12:04:03 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Linux-sh list <linux-sh@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [patch] sh: off by one BUG_ON() in setup_bootmem_node()

On Thu, Dec 4, 2014 at 12:01 PM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> This off by one bug is harmless but it upsets the static checkers and
> the code is obvious so it doesn't hurt to fix it.  The Smatch warning
> is:
>
>         arch/sh/mm/numa.c:47 setup_bootmem_node()
>         error: buffer overflow 'node_data' 1024 <= 1024
>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>

> diff --git a/arch/sh/mm/numa.c b/arch/sh/mm/numa.c
> index 3d85225..bce52ba 100644
> --- a/arch/sh/mm/numa.c
> +++ b/arch/sh/mm/numa.c
> @@ -31,7 +31,7 @@ void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
>         unsigned long bootmem_paddr;
>
>         /* Don't allow bogus node assignment */
> -       BUG_ON(nid > MAX_NUMNODES || nid <= 0);
> +       BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
>
>         start_pfn = start >> PAGE_SHIFT;
>         end_pfn = end >> PAGE_SHIFT;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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