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Message-ID: <CADnq5_OyK=rDH38Q8Kiyq9BhWuihgd8wX7XKAffxwkO4w+ksog@mail.gmail.com>
Date:   Sun, 12 Nov 2023 13:00:37 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org,
        Mario Limonciello <mario.limonciello@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH AUTOSEL 6.6 09/11] drm/amd: Fix UBSAN array-index-out-of-bounds
 for Powerplay headers

On Sun, Nov 12, 2023 at 8:27 AM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Alex Deucher <alexander.deucher@....com>
>
> [ Upstream commit 49afe91370b86566857a3c2c39612cf098110885 ]
>
> For pptable structs that use flexible array sizes, use flexible arrays.
>
> Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2039926
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> Acked-by: Christian König <christian.koenig@....com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

I don't think any of these UBSAN flexible array changes are stable material.

Alex

> ---
>  .../drm/amd/pm/powerplay/hwmgr/pptable_v1_0.h |  4 ++--
>  .../amd/pm/powerplay/hwmgr/vega10_pptable.h   | 24 +++++++++----------
>  2 files changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/pptable_v1_0.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/pptable_v1_0.h
> index 7a31cfa5e7fb4..df7cab1a571b3 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/pptable_v1_0.h
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/pptable_v1_0.h
> @@ -367,7 +367,7 @@ typedef struct _ATOM_Tonga_VCE_State_Record {
>  typedef struct _ATOM_Tonga_VCE_State_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;
> -       ATOM_Tonga_VCE_State_Record entries[1];
> +       ATOM_Tonga_VCE_State_Record entries[];
>  } ATOM_Tonga_VCE_State_Table;
>
>  typedef struct _ATOM_Tonga_PowerTune_Table {
> @@ -481,7 +481,7 @@ typedef struct _ATOM_Tonga_Hard_Limit_Record {
>  typedef struct _ATOM_Tonga_Hard_Limit_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;
> -       ATOM_Tonga_Hard_Limit_Record entries[1];
> +       ATOM_Tonga_Hard_Limit_Record entries[];
>  } ATOM_Tonga_Hard_Limit_Table;
>
>  typedef struct _ATOM_Tonga_GPIO_Table {
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> index 8b0590b834cca..de2926df5ed74 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> @@ -129,7 +129,7 @@ typedef struct _ATOM_Vega10_State {
>  typedef struct _ATOM_Vega10_State_Array {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                         /* Number of entries. */
> -       ATOM_Vega10_State states[1];                             /* Dynamically allocate entries. */
> +       ATOM_Vega10_State states[];                             /* Dynamically allocate entries. */
>  } ATOM_Vega10_State_Array;
>
>  typedef struct _ATOM_Vega10_CLK_Dependency_Record {
> @@ -169,37 +169,37 @@ typedef struct _ATOM_Vega10_GFXCLK_Dependency_Table {
>  typedef struct _ATOM_Vega10_MCLK_Dependency_Table {
>      UCHAR ucRevId;
>      UCHAR ucNumEntries;                                         /* Number of entries. */
> -    ATOM_Vega10_MCLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +    ATOM_Vega10_MCLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_MCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_SOCCLK_Dependency_Table {
>      UCHAR ucRevId;
>      UCHAR ucNumEntries;                                         /* Number of entries. */
> -    ATOM_Vega10_CLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +    ATOM_Vega10_CLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_SOCCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_DCEFCLK_Dependency_Table {
>      UCHAR ucRevId;
>      UCHAR ucNumEntries;                                         /* Number of entries. */
> -    ATOM_Vega10_CLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +    ATOM_Vega10_CLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_DCEFCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_PIXCLK_Dependency_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                         /* Number of entries. */
> -       ATOM_Vega10_CLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +       ATOM_Vega10_CLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_PIXCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_DISPCLK_Dependency_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                         /* Number of entries.*/
> -       ATOM_Vega10_CLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +       ATOM_Vega10_CLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_DISPCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_PHYCLK_Dependency_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                         /* Number of entries. */
> -       ATOM_Vega10_CLK_Dependency_Record entries[1];            /* Dynamically allocate entries. */
> +       ATOM_Vega10_CLK_Dependency_Record entries[];            /* Dynamically allocate entries. */
>  } ATOM_Vega10_PHYCLK_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_MM_Dependency_Record {
> @@ -213,7 +213,7 @@ typedef struct _ATOM_Vega10_MM_Dependency_Record {
>  typedef struct _ATOM_Vega10_MM_Dependency_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                         /* Number of entries */
> -       ATOM_Vega10_MM_Dependency_Record entries[1];             /* Dynamically allocate entries */
> +       ATOM_Vega10_MM_Dependency_Record entries[];             /* Dynamically allocate entries */
>  } ATOM_Vega10_MM_Dependency_Table;
>
>  typedef struct _ATOM_Vega10_PCIE_Record {
> @@ -225,7 +225,7 @@ typedef struct _ATOM_Vega10_PCIE_Record {
>  typedef struct _ATOM_Vega10_PCIE_Table {
>         UCHAR  ucRevId;
>         UCHAR  ucNumEntries;                                        /* Number of entries */
> -       ATOM_Vega10_PCIE_Record entries[1];                      /* Dynamically allocate entries. */
> +       ATOM_Vega10_PCIE_Record entries[];                      /* Dynamically allocate entries. */
>  } ATOM_Vega10_PCIE_Table;
>
>  typedef struct _ATOM_Vega10_Voltage_Lookup_Record {
> @@ -235,7 +235,7 @@ typedef struct _ATOM_Vega10_Voltage_Lookup_Record {
>  typedef struct _ATOM_Vega10_Voltage_Lookup_Table {
>         UCHAR ucRevId;
>         UCHAR ucNumEntries;                                          /* Number of entries */
> -       ATOM_Vega10_Voltage_Lookup_Record entries[1];             /* Dynamically allocate entries */
> +       ATOM_Vega10_Voltage_Lookup_Record entries[];             /* Dynamically allocate entries */
>  } ATOM_Vega10_Voltage_Lookup_Table;
>
>  typedef struct _ATOM_Vega10_Fan_Table {
> @@ -327,7 +327,7 @@ typedef struct _ATOM_Vega10_VCE_State_Record {
>  typedef struct _ATOM_Vega10_VCE_State_Table {
>      UCHAR ucRevId;
>      UCHAR ucNumEntries;
> -    ATOM_Vega10_VCE_State_Record entries[1];
> +    ATOM_Vega10_VCE_State_Record entries[];
>  } ATOM_Vega10_VCE_State_Table;
>
>  typedef struct _ATOM_Vega10_PowerTune_Table {
> @@ -427,7 +427,7 @@ typedef struct _ATOM_Vega10_Hard_Limit_Record {
>  typedef struct _ATOM_Vega10_Hard_Limit_Table {
>      UCHAR ucRevId;
>      UCHAR ucNumEntries;
> -    ATOM_Vega10_Hard_Limit_Record entries[1];
> +    ATOM_Vega10_Hard_Limit_Record entries[];
>  } ATOM_Vega10_Hard_Limit_Table;
>
>  typedef struct _Vega10_PPTable_Generic_SubTable_Header {
> --
> 2.42.0
>

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