linux-kernel - Re: Null dereference errors in the kernel

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Message-ID: <m3lkqqv8sy.fsf@telia.com>
Date:	19 Jul 2006 00:37:33 +0200
From:	Peter Osterlund <petero2@...ia.com>
To:	Dave Jones <davej@...hat.com>
Cc:	Thomas Dillig <tdillig@...nford.edu>, linux-kernel@...r.kernel.org
Subject: Re: Null dereference errors in the kernel

Dave Jones <davej@...hat.com> writes:

> On Mon, Jul 17, 2006 at 08:49:19PM -0700, Thomas Dillig wrote:
> 
>  > 144 drivers/char/agp/ati-agp.c
>  > NULL dereference of variable "ati_generic_private.gatt_pages" in 
>  > function call (drivers/char/agp/ati-agp.c:ati_free_gatt_pages).
>  
> I think this is a false positive.

I don't think so. If the 'entry = kzalloc(...)' fails at line 125, the
code will set tables to NULL and retval to != 0. ati_free_gatt_pages()
will then be called with .gatt_pages == NULL and .num_tables > 0. This
will trigger a NULL pointer dereference in ati_free_gatt_pages().

-- 
Peter Osterlund - petero2@...ia.com
http://web.telia.com/~u89404340
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