ASoC: SOF: Intel: hda: fix null deref on system suspend entry

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: Intel: hda: fix null deref on system suspend entry When system enters suspend with an active stream, SOF core calls hw_params_upon_resume(). On Intel platforms with HDA DMA used to manage the link DMA, this leads to call chain of hda_dsp_set_hw_params_upon_resume() -> hda_dsp_dais_suspend() -> hda_dai_suspend() -> hda_ipc4_post_trigger() A bug is hit in hda_dai_suspend() as hda_link_dma_cleanup() is run first, which clears hext_stream->link_substream, and then hda_ipc4_post_trigger() is called with a NULL snd_pcm_substream pointer.

References

• https://git.kernel.org/stable/c/8246bbf818ed7b8d5afc92b951e6d562b45c2450
• https://git.kernel.org/stable/c/993af0f2d9f24e3c18a445ae22b34190d1fcad61
• https://git.kernel.org/stable/c/9065693dcc13f287b9e4991f43aee70cf5538fdd