linux-kernel - Re: [patch] radeon: range check issues

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Date:	Wed, 31 Mar 2010 23:43:23 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Dan Carpenter <error27@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	Alex Deucher <alexdeucher@...il.com>,
	Jerome Glisse <jglisse@...hat.com>,
	Rafał Miłecki <zajec5@...il.com>,
	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [patch] radeon: range check issues

On Sun, Mar 28, 2010 at 7:23 AM, Dan Carpenter <error27@...il.com> wrote:
> This change makes the array larger, "MAX_SUPPORTED_TV_TIMING_V1_2" is 3
> and the original size "MAX_SUPPORTED_TV_TIMING" is 2.
>
> Also there were checks that were off by one.
>
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> Compile tested only.  Changing the array size seemed like the right
> thing to do, in the context, but please review carefully.

That patch is correct and corresponds to the actual table sizes in the vbios.

Alex


>
> diff --git a/drivers/gpu/drm/radeon/atombios.h b/drivers/gpu/drm/radeon/atombios.h
> index 6732b5d..27e2c71 100644
> --- a/drivers/gpu/drm/radeon/atombios.h
> +++ b/drivers/gpu/drm/radeon/atombios.h
> @@ -2912,7 +2912,7 @@ typedef struct _ATOM_ANALOG_TV_INFO_V1_2
>   UCHAR                    ucTV_BootUpDefaultStandard;
>   UCHAR                    ucExt_TV_ASIC_ID;
>   UCHAR                    ucExt_TV_ASIC_SlaveAddr;
> -  ATOM_DTD_FORMAT          aModeTimings[MAX_SUPPORTED_TV_TIMING];
> +  ATOM_DTD_FORMAT          aModeTimings[MAX_SUPPORTED_TV_TIMING_V1_2];
>  }ATOM_ANALOG_TV_INFO_V1_2;
>
>  typedef struct _ATOM_DPCD_INFO
> diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
> index 93783b1..bdc0ab3 100644
> --- a/drivers/gpu/drm/radeon/radeon_atombios.c
> +++ b/drivers/gpu/drm/radeon/radeon_atombios.c
> @@ -1275,7 +1275,7 @@ bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
>        switch (crev) {
>        case 1:
>                tv_info = (ATOM_ANALOG_TV_INFO *)(mode_info->atom_context->bios + data_offset);
> -               if (index > MAX_SUPPORTED_TV_TIMING)
> +               if (index >= MAX_SUPPORTED_TV_TIMING)
>                        return false;
>
>                mode->crtc_htotal = le16_to_cpu(tv_info->aModeTimings[index].usCRTC_H_Total);
> @@ -1313,7 +1313,7 @@ bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
>                break;
>        case 2:
>                tv_info_v1_2 = (ATOM_ANALOG_TV_INFO_V1_2 *)(mode_info->atom_context->bios + data_offset);
> -               if (index > MAX_SUPPORTED_TV_TIMING_V1_2)
> +               if (index >= MAX_SUPPORTED_TV_TIMING_V1_2)
>                        return false;
>
>                dtd_timings = &tv_info_v1_2->aModeTimings[index];
>
>
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