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If snd_hda_hdmi_codec module is denylisted and any event causes i915 enumeration to fail, is_likely_hdmi_codec() ends in null-ptr-deref. As snd_soc_hda is an ASoC-based driver, its initialization is delayed until all the necessary components appear in the system - allowing actual sound card to enumerate. snd_hda_codec_configure() gets called by the avs-driver core during probe_codecs() but the snd_hda_codec_device_new(), necessary to complete codecs initialization, happens only when codec-component of hda sound card is being probed. Denylisting snd_hda_codec_hdmi module causes snd_hda_codec_configure() to reach: codec_bind_generic() -> is_likely_hdmi_codec() which makes use of ->wcaps and at this point the it isn't initialized yet - again, requires completion of snd_hda_codec_device_new(). Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lore.kernel.org/r/20220706120230.427296-3-cezary.rojewski@intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.