linux-kernel - Re: [PATCH] AHCI: fix Null pointer dereference in achi_host

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Message-ID: <20130722212822.GB16776@mtj.dyndns.org>
Date:	Mon, 22 Jul 2013 17:28:22 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	Alexander Gordeev <agordeev@...hat.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] AHCI: fix Null pointer dereference in achi_host_active()

Hello, Xiaotian.

Thanks for the fix.  A couple comments below.

On Wed, Jul 17, 2013 at 02:10:39PM +0800, Xiaotian Feng wrote:
>  	for (i = 0; i < host->n_ports; i++) {
>  		struct ahci_port_priv *pp = host->ports[i]->private_data;
> +		const char *desc;
>  
> +		if (ata_port_is_dummy(host->ports[i]))
> +			desc = dev_driver_string(host->dev);
> +		else
> +			desc = pp->irq_desc;

I think it'd be better to branch on pp.  ie. do "if (pp) desc =
pp->... " instead and then add a comment saying "pp is NULL for
dummies".

Thanks!

-- 
tejun
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