From: Harry Wentland harry.wentland@amd.com
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 --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -4634,7 +4634,7 @@ static void dp_test_get_audio_test_data( &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 ||