Re: [PATCH] drm/amd/display: fix array-bounds error in dc_stream_remove_writeback()

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Reviewed-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>

--

Regards,
Jay

From: Mahfooz, Hamza <Hamza.Mahfooz@xxxxxxx>
Sent: Tuesday, September 27, 2022 3:12 PM
To: linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx>
Cc: Mahfooz, Hamza <Hamza.Mahfooz@xxxxxxx>; Wentland, Harry <Harry.Wentland@xxxxxxx>; Li, Sun peng (Leo) <Sunpeng.Li@xxxxxxx>; Siqueira, Rodrigo <Rodrigo.Siqueira@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>; David Airlie <airlied@xxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; Lee, Alvin <Alvin.Lee2@xxxxxxx>; Hung, Alex <Alex.Hung@xxxxxxx>; Kotarac, Pavle <Pavle.Kotarac@xxxxxxx>; Wang, Chao-kai (Stylon) <Stylon.Wang@xxxxxxx>; Pillai, Aurabindo <Aurabindo.Pillai@xxxxxxx>; Ma, Leo <Hanghong.Ma@xxxxxxx>; Wu, Hersen <hersenxs.wu@xxxxxxx>; Po-Yu Hsieh Paul <Paul.Hsieh@xxxxxxx>; Jimmy Kizito <Jimmy.Kizito@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx <dri-devel@xxxxxxxxxxxxxxxxxxxxx>
Subject: [PATCH] drm/amd/display: fix array-bounds error in dc_stream_remove_writeback()
 
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@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 3ca1592ce7ac..ae13887756bf 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -520,7 +520,7 @@ bool dc_stream_remove_writeback(struct dc *dc,
         }
 
         /* remove writeback info for disabled writeback pipes from stream */
-       for (i = 0, j = 0; i < stream->num_wb_info; i++) {
+       for (i = 0, j = 0; i < stream->num_wb_info && j < MAX_DWB_PIPES; i++) {
                 if (stream->writeback_info[i].wb_enabled) {
                         if (i != j)
                                 /* trim the array */
--
2.37.2


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