[AMD Official Use Only - General]
Reviewed-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
--
Regards,
Jay
________________________________
From: Mahfooz, Hamza <hamza.mahf...@amd.com>
Sent: Tuesday, September 27, 2022 3:12 PM
To: linux-ker...@vger.kernel.org <linux-ker...@vger.kernel.org>
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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.mahf...@amd.com>
---
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
