6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Hersen Wu hersenxs.wu@amd.com
[ Upstream commit f1fd8a0a54e6d23a6d16ee29159f247862460fd1 ]
[WHY] &mode_lib->mp.Watermark and &locals->Watermark are the same address. memcpy may lead to unexpected behavior.
[HOW] memmove should be used.
Reviewed-by: Rodrigo Siqueira rodrigo.siqueira@amd.com Acked-by: Wayne Lin wayne.lin@amd.com Reviewed-by: Alex Hung alex.hung@amd.com Signed-off-by: Hersen Wu hersenxs.wu@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c index 9be5ebf3a8c0b..79cd4c4790439 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c @@ -9460,8 +9460,10 @@ void dml_core_mode_programming(struct display_mode_lib_st *mode_lib, const struc
/* Copy the calculated watermarks to mp.Watermark as the getter functions are * implemented by the DML team to copy the calculated values from the mp.Watermark interface. + * &mode_lib->mp.Watermark and &locals->Watermark are the same address, memcpy may lead to + * unexpected behavior. memmove should be used. */ - memcpy(&mode_lib->mp.Watermark, CalculateWatermarks_params->Watermark, sizeof(struct Watermarks)); + memmove(&mode_lib->mp.Watermark, CalculateWatermarks_params->Watermark, sizeof(struct Watermarks));
for (k = 0; k < mode_lib->ms.num_active_planes; ++k) { if (mode_lib->ms.cache_display_cfg.writeback.WritebackEnable[k] == true) {