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| author |   Harry Wentland <harry.wentland@amd.com> | 2022-04-19 13:03:12 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2022-05-04 09:51:40 -0400 |
| commit | 0ee42ab70118ace9a09861bccaaf43e9779fa91e (patch) | |
| tree | efae47f7865d28defdb003fb0f5fa246d291b4f9 /drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | |
| parent | drm/amdgpu: Free user pages if amdgpu_cs_parser_bos failed (diff) | |
| download | linux-dev-0ee42ab70118ace9a09861bccaaf43e9779fa91e.tar.xz linux-dev-0ee42ab70118ace9a09861bccaaf43e9779fa91e.zip | |
drm/amd/display: Avoid reading audio pattern past AUDIO_CHANNELS_COUNT
A faulty receiver might report an erroneous channel count. We
should guard against reading beyond AUDIO_CHANNELS_COUNT as
that would overflow the dpcd_pattern_period array.
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index c15c46b81111..55a5a6a49fe2 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -4464,7 +4464,7 @@ static void dp_test_get_audio_test_data(struct dc_link *link, bool disable_video &dpcd_pattern_type.value, sizeof(dpcd_pattern_type)); - channel_count = dpcd_test_mode.bits.channel_count + 1; + channel_count = min(dpcd_test_mode.bits.channel_count + 1, AUDIO_CHANNELS_COUNT); // read pattern periods for requested channels when sawTooth pattern is requested if (dpcd_pattern_type.value == AUDIO_TEST_PATTERN_SAWTOOTH || |