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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Wed, 5 Oct 2022 23:46:15 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Hamza Mahfooz <hamza.mahfooz@amd.com>
Cc:     linux-kernel@vger.kernel.org,
        Harry Wentland <harry.wentland@amd.com>,
        Leo Li <sunpeng.li@amd.com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        "Lee, Alvin" <Alvin.Lee2@amd.com>, Alex Hung <alex.hung@amd.com>,
        Pavle Kotarac <Pavle.Kotarac@amd.com>,
        Stylon Wang <stylon.wang@amd.com>,
        Aurabindo Pillai <aurabindo.pillai@amd.com>,
        "Leo (Hanghong) Ma" <hanghong.ma@amd.com>,
        Hersen Wu <hersenwu@amd.com>, Paul Hsieh <paul.hsieh@amd.com>,
        Jimmy Kizito <Jimmy.Kizito@amd.com>,
        amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/amd/display: fix array-bounds error in
 dc_stream_remove_writeback()
Message-ID: <20221006064615.GA2817657@roeck-us.net>
References: <20220927191200.216488-1-hamza.mahfooz@amd.com>
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On Tue, Sep 27, 2022 at 03:12:00PM -0400, Hamza Mahfooz wrote:
> Address the following error:
> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function ‘dc_stream_remove_writeback’:
> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:55: error: array subscript [0, 0] is outside array bounds of ‘struct dc_writeback_info[1]’ [-Werror=array-bounds]
>   527 |                                 stream->writeback_info[j] = stream->writeback_info[i];
>       |                                 ~~~~~~~~~~~~~~~~~~~~~~^~~
> In file included from ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:1269,
>                  from ./drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:29,
>                  from ./drivers/gpu/drm/amd/amdgpu/../display/dc/basics/dc_common.h:29,
>                  from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:27:
> ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc_stream.h:241:34: note: while referencing ‘writeback_info’
>   241 |         struct dc_writeback_info writeback_info[MAX_DWB_PIPES];
>       |
> 
> Currently, we aren't checking to see if j remains within
> writeback_info[]'s bounds. So, add a check to make sure that we aren't
> overflowing the buffer.
> 
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>

With gcc 11.3, this patch doesn't fix a problem, it introduces one.

Building csky:allmodconfig ... failed
--------------
Error log:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function 'dc_stream_remove_writeback':
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:83: error: array subscript 1 is above array bounds of 'struct dc_writeback_info[1]' [-Werror=array-bounds]
  527 |                                 stream->writeback_info[j] = stream->writeback_info[i];

Building mips:allmodconfig ... failed
--------------
Error log:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function 'dc_stream_remove_writeback':
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:83: error: array subscript [0, 0] is outside array bounds of 'struct dc_writeback_info[1]' [-Werror=array-bounds]
  527 |                                 stream->writeback_info[j] = stream->writeback_info[i];

Building arm:allmodconfig ... failed
--------------
Error log:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function 'dc_stream_remove_writeback':
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:83: error: array subscript [0, 0] is outside array bounds of 'struct dc_writeback_info[1]' [-Werror=array-bounds]
  527 |                                 stream->writeback_info[j] = stream->writeback_info[i];

Guenter