linux-kernel - Re: [patch 3/3] ThinkPad ACPI: fix possible NULL pointer dereference

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Date:	Fri, 18 Apr 2008 14:41:12 +0200
From:	Pavel Machek <pavel@....cz>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	bfields@...ldses.org, neilb@...e.de, ibm-acpi@....eng.br,
	len.brown@...el.com, kkeil@...e.de, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] ThinkPad ACPI: fix possible NULL pointer dereference

Hi!

> Fix potential NULL pointer dereference if kstrdup failed
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
> 
> ---
> 
> Index: linux-2.6.git/drivers/misc/thinkpad_acpi.c
> ===================================================================
> --- linux-2.6.git.orig/drivers/misc/thinkpad_acpi.c	2008-04-16 20:35:34.000000000 +0400
> +++ linux-2.6.git/drivers/misc/thinkpad_acpi.c	2008-04-16 20:36:38.000000000 +0400
> @@ -5826,7 +5826,7 @@ static void __init get_thinkpad_model_da
>  
>  	tp->model_str = kstrdup(dmi_get_system_info(DMI_PRODUCT_VERSION),
>  					GFP_KERNEL);
> -	if (strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
> +	if (tp->model_str && strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
>  		kfree(tp->model_str);
>  		tp->model_str = NULL;
>  	}

are you sure? This seems to assume machine is thinkpad if kstrdup
fails... which is very wrong.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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