linux-kernel - Re: [PATCH 3/6] gpu: host1x: Fix memory access in syncpt request

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Message-ID: <51A3039E.5090808@nvidia.com>
Date:	Mon, 27 May 2013 09:56:30 +0300
From:	Arto Merilainen <amerilainen@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	"airlied@...ux.ie" <airlied@...ux.ie>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Terje Bergstrom <tbergstrom@...dia.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] gpu: host1x: Fix memory access in syncpt request

On 05/26/2013 01:15 PM, Thierry Reding wrote:
> * PGP Signed by an unknown key
>
> On Fri, May 17, 2013 at 02:49:45PM +0300, Arto Merilainen wrote:
>> This patch fixes a bad memory access in syncpoint request code. If
>> no syncpoints were available, the code accessed unreserved memory
>> area causing unexpected behaviour.
>>
>> Signed-off-by: Arto Merilainen <amerilainen@...dia.com>
>> ---
>>   drivers/gpu/host1x/syncpt.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
>> index 5bf5366..6b7ee88 100644
>> --- a/drivers/gpu/host1x/syncpt.c
>> +++ b/drivers/gpu/host1x/syncpt.c
>> @@ -40,7 +40,7 @@ static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host,
>>
>>   	for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
>>   		;
>> -	if (sp->dev)
>> +	if (i >= host->info->nb_pts)
>>   		return NULL;
>
> While changing this, can you please add a blank line between the loop
> and the new 'if (...)'?
>

Yep. Will do.

- Arto
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