linux-kernel - Re: [PATCH] EDAC, MCE, AMD: Fix code to prevent NULL dereference

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Date:	Mon, 17 Feb 2014 13:26:20 -0600
From:	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
To:	Borislav Petkov <bp@...en8.de>
CC:	<dougthompson@...ssion.com>, <linux-edac@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] EDAC, MCE, AMD: Fix code to prevent NULL dereference

On 2/17/2014 12:27 PM, Borislav Petkov wrote:
> On Mon, Feb 17, 2014 at 11:49:51AM -0600, Aravind Gopalakrishnan wrote:
>> If MCE decoding support does not exist for a particular family/model,
>> and if one tries to inject errors using mce_amd_inj module, it leads
>> to kernel OOPS. Especially if we inject errors to MC0, MC1, MC2 banks.
> Well, we shouldn't even be loading the module on unsupported hw, i.e.,
> something like that:
>
>   
>   	if (c->x86_vendor != X86_VENDOR_AMD)
> -		return 0;
> +		return -ENODEV;
>   
>   	if (c->x86 < 0xf || c->x86 > 0x16)
> -		return 0;
> +		return -ENODEV;
>   
Ah. you are right. (I had tested against different family/model checks 
that happen to throw NULL dereference)
You can ignore the patch.

Apologies for the trouble.

-Aravind.

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