linux-kernel - Re: [PATCH v2] efifb: prevent null-deref when iterating dmi

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Message-ID: <20131101111020.GD18477@ns203013.ovh.net>
Date:	Fri, 1 Nov 2013 12:10:20 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	James Bates <james.h.bates@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	James Bates <james.h.bates@...oo.com>
Subject: Re: [PATCH v2] efifb: prevent null-deref when iterating dmi_list

On 17:17 Thu 31 Oct     , David Herrmann wrote:
> Hi
> 
> On Thu, Oct 31, 2013 at 11:45 AM, Jean-Christophe PLAGNIOL-VILLARD
> <plagnioj@...osoft.com> wrote:
> > On 18:40 Wed 02 Oct     , David Herrmann wrote:
> >> The dmi_list array is initialized using gnu designated initializers, and
> >> therefore may contain fewer explicitly defined entries as there are
> >> elements in it. This is because the enum above with M_xyz constants
> >> contains more items than the designated initializer. Those elements not
> >> explicitly initialized are implicitly set to 0.
> >>
> >> Now efifb_setup() loops through all these array elements, and performs
> >> a strcmp on each item. For non explicitly initialized elements this will
> >> be a null pointer:
> >>
> >> This patch swaps the check order in the if statement, thus checks first
> >> whether dmi_list[i].base is null.
> >>
> >> Signed-off-by: James Bates <james.h.bates@...oo.com>
> >> Signed-off-by: David Herrmann <dh.herrmann@...il.com>
> >
> > with the simpleDRM arriving next merge I'm wondering if we need to keep it?
> 
> SimpleDRM is not coming next merge-window. It's basically finished,
> but I'm still working on the user-space side as its KMS api is highly
> reduced compared to fully-featured DRM/KMS drivers. Maybe 3.13 will
> work out.

do you have a git tree for the simpleDRM that I can pull?
> 
> Anyhow, this patch is still needed as it fixes a serious bug for simplefb.

ok
> 
> Thanks
> David
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