ASoC: SOF: Intel: hda: Fix NULL pointer dereference #5650
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ranj063
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If there's a mismatch between the DAI links in the machine driver and the topology, it is possible that the playback/capture widget is not set, especially in the case of loopback capture for echo reference where we use the dummy DAI link. Return the error when the widget is not set to avoid a null pointer dereference like below when the topology is broken. RIP: 0010:hda_dai_get_ops.isra.0+0x14/0xa0 [snd_sof_intel_hda_common] Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Add a virtual CPU DAI for loopback capture for echo reference implementation. We can't use the snd-soc-dummy-dai because it is already used for the bluetooth DAI link. Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Don't use the dummy CPU DAI but use the virtual loopback capture CPU DAI instead. Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
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If there's a mismatch between the DAI links in the machine driver and the topology, it is possible that the playback/capture widget is not set, especially in the case of iloopback capture for echo reference where we use the dummy DAI link. Return the error when the widget is not set to avoid a null pointer dereference like below when the topology is broken.
RIP: 0010:hda_dai_get_ops.isra.0+0x14/0xa0 [snd_sof_intel_hda_common]