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ASoC: SOF: Intel: hda-dai: fix possible stream_tag leak
authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Thu, 16 Feb 2023 16:23:40 +0000 (18:23 +0200)
committerMark Brown <broonie@kernel.org>
Thu, 16 Feb 2023 16:31:15 +0000 (16:31 +0000)
commit1f810d2b6b2fbdc5279644d8b2c140b1f7c9d43d
treeef1da81e54aa5c3b482ac48b9eb0a9491a803b0e
parent5afc7eefe41645259da84898fc55f6f46cb4de47
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: b0cd60f3e9f5 ("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>
sound/soc/sof/intel/hda-dai.c