CVE-2024-42088

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

ASoC: mediatek: mt8195: Add platform entry for ETDM1_OUT_BE dai link

Commit e70b8dd26711 ("ASoC: mediatek: mt8195: Remove afe-dai component

and rework codec link") removed the codec entry for the ETDM1_OUT_BE

dai link entirely instead of replacing it with COMP_EMPTY(). This worked

by accident as the remaining COMP_EMPTY() platform entry became the codec

entry, and the platform entry became completely empty, effectively the

same as COMP_DUMMY() since snd_soc_fill_dummy_dai() doesn't do anything

for platform entries.

This causes a KASAN out-of-bounds warning in mtk_soundcard_common_probe()

in sound/soc/mediatek/common/mtk-soundcard-driver.c:

for_each_card_prelinks(card, i, dai_link) {

if (adsp_node && !strncmp(dai_link->name, "AFE_SOF", strlen("AFE_SOF")))

dai_link->platforms->of_node = adsp_node;

else if (!dai_link->platforms->name && !dai_link->platforms->of_node)

dai_link->platforms->of_node = platform_node;

}

where the code expects the platforms array to have space for at least one entry.

Add an COMP_EMPTY() entry so that dai_link->platforms has space.