[AMD Official Use Only - General]
[AMD Official Use Only - General]
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
