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drm/amd/display: Avoid reading audio pattern past AUDIO_CHANNELS_COUNT

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commit 3dfe85fa87b2a26bdbd292b66653bba065cf9941 upstream.

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>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Harry Wentland 2022-04-19 13:03:12 -04:00 committed by Greg Kroah-Hartman
parent 2c14dda7a4
commit c10bab89a1
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -3118,7 +3118,7 @@ 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 ||