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Change History

In the Linux kernel, the following vulnerability has been resolved:

drm/connector: only call HDMI audio helper plugged cb if non-null

On driver remove, sound/soc/codecs/hdmi-codec.c calls the plugged_cb
with NULL as the callback function and codec_dev, as seen in its
hdmi_remove function.

The HDMI audio helper then happily tries calling said null function
pointer, and produces an Oops as a result.

Fix this by only executing the callback if fn is non-null. This means
the .plugged_cb and .plugged_cb_dev members still get appropriately
cleared.

https://git.kernel.org/stable/c/933f3eab1d489af8d734bff855b10d29dd5968a4

https://git.kernel.org/stable/c/be9b3f9a54101c19226c25ba7163d291183777a0