CVE-2024-42088 Information

Description

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.

Reference

https://git.kernel.org/stable/c/42b9ab7a4d7e6c5efd71847541e4fcc213585aad https://git.kernel.org/stable/c/282a4482e198e03781c152c88aac8aa382ef9a55