linux-kernel - Re: BUG: key ffff880c1148c478 not in .data! (V3.10.0)

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Date:	Sat, 20 Jul 2013 05:55:44 +0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Ming Lei <tom.leiming@...il.com>, Linda Walsh <lkml@...nx.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: BUG: key ffff880c1148c478 not in .data! (V3.10.0)

Em Fri, 19 Jul 2013 01:27:18 +0200
Borislav Petkov <bp@...en8.de> escreveu:

> On Thu, Jul 18, 2013 at 04:51:48PM +0000, Luck, Tony wrote:
> > +	BUG_ON(mci->mc_idx >= EDAC_MAX_MCS);
> > 
> > Do we have to "BUG_ON()" here?  Couldn't we be gentler with something like:
> > 
> > 	if (mci->mc_idx >= EDAC_MAX_MCS) {
> > 		printk_once(KERN_WARNING "Too many memory controllers\n");
> > 		return; /* probably need to make sure caller copes with this ... so more stuff there */
> 
> Yeah, we can do something like this:

With this change, the patch looks ok for me.

Acked-by: Mauro Carvalho Chehab <m.chehab@...sung.com>
> 
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 429e971e02d7..c55ad285c285 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -725,6 +725,11 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
>  	int ret = -EINVAL;
>  	edac_dbg(0, "\n");
>  
> +	if (mci->mc_idx >= EDAC_MAX_MCS) {
> +		pr_warn_once("Too many memory controllers: %d\n", mci->mc_idx);
> +		return ret;
> +	}
> +
>  #ifdef CONFIG_EDAC_DEBUG
>  	if (edac_debug_level >= 3)
>  		edac_mc_dump_mci(mci);
> --
> 
> right near the beginning of the function so that we can save us the
> unwinding.
> 




Cheers,
Mauro
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