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ASoC: SOF: Intel: hda-dai: fix possible stream_tag leak 

The HDaudio stream allocation is done first, and in a second step the
LOSIDV parameter is programmed for the multi-link used by a codec.

This leads to a possible stream_tag leak, e.g. if a DisplayAudio link
is not used. This would happen when a non-Intel graphics card is used
and userspace unconditionally uses the Intel Display Audio PCMs without
checking if they are connected to a receiver with jack controls.

We should first check that there is a valid multi-link entry to
configure before allocating a stream_tag. This change aligns the
dma_assign and dma_cleanup phases.

Complements: b0cd60f3e9 ("ALSA/ASoC: hda: clarify bus_get_link() and bus_link_get() helpers")
Link: https://github.com/thesofproject/linux/issues/4151
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230216162340.19480-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2023-02-16 18:23:40 +02:00 committed by Mark Brown
parent 5afc7eefe4
commit 1f810d2b6b
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GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 4 deletions
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8
sound/soc/sof/intel/hda-dai.c
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@ -216,6 +216,10 @@ static int hda_link_dma_hw_params(struct snd_pcm_substream *substream,
sdev = snd_soc_component_get_drvdata(cpu_dai->component);
bus = sof_to_bus(sdev);
hlink = snd_hdac_ext_bus_get_hlink_by_name(bus, codec_dai->component->name);
if (!hlink)
return -EINVAL;
hext_stream = snd_soc_dai_get_dma_data(cpu_dai, substream);
if (!hext_stream) {
hext_stream = hda_link_stream_assign(bus, substream);
@ -225,10 +229,6 @@ static int hda_link_dma_hw_params(struct snd_pcm_substream *substream,
snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)hext_stream);
}
hlink = snd_hdac_ext_bus_get_hlink_by_name(bus, codec_dai->component->name);
if (!hlink)
return -EINVAL;
/* set the hdac_stream in the codec dai */
snd_soc_dai_set_stream(codec_dai, hdac_stream(hext_stream), substream->stream);