From: Hamza Mahfooz <hamza.mahf...@amd.com>

[ Upstream commit 5d8c3e836fc224dfe633e41f7f2856753b39a905 ]

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.

Reviewed-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahf...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 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 d48fd87d3b95..867b8b66293a 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -491,7 +491,7 @@ 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 */
-- 
2.35.1

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