From: Leo Chen leo.chen@amd.com
[ Upstream commit 2c437d9a0b496168e1a1defd17b531f0a526dbe9 ]
[Why & How] Array indices out of bound caused memory corruption. Adding checks to ensure that array index stays in bound.
Reviewed-by: Charlene Liu charlene.liu@amd.com Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Leo Chen leo.chen@amd.com Signed-off-by: Wayne Lin wayne.lin@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c index a54d7358d9e9b..c6867b0849a87 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c @@ -242,11 +242,11 @@ static void dcn35_notify_host_router_bw(struct clk_mgr *clk_mgr_base, struct dc_ struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base); uint32_t host_router_bw_kbps[MAX_HOST_ROUTERS_NUM] = { 0 }; int i; - for (i = 0; i < context->stream_count; ++i) { const struct dc_stream_state *stream = context->streams[i]; const struct dc_link *link = stream->link; - uint8_t lowest_dpia_index = 0, hr_index = 0; + uint8_t lowest_dpia_index = 0; + unsigned int hr_index = 0;
if (!link) continue; @@ -256,6 +256,8 @@ static void dcn35_notify_host_router_bw(struct clk_mgr *clk_mgr_base, struct dc_ continue;
hr_index = (link->link_index - lowest_dpia_index) / 2; + if (hr_index >= MAX_HOST_ROUTERS_NUM) + continue; host_router_bw_kbps[hr_index] += dc_bandwidth_in_kbps_from_timing( &stream->timing, dc_link_get_highest_encoding_format(link)); }