Bug 2300540 (CVE-2024-42088)

Summary: CVE-2024-42088 kernel: ASoC: mediatek: mt8195: Add platform entry for ETDM1_OUT_BE dai link
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Fixed In Version: kernel 6.9.8, kernel 6.10 Doc Type: If docs needed, set a value
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Bug Depends On: 2301740    
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Description OSIDB Bzimport 2024-07-29 17:21:08 UTC 
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.
Comment 1 Mauro Matteo Cascella 2024-07-30 17:26:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024072945-CVE-2024-42088-b65a@gregkh/T
Comment 2 Mauro Matteo Cascella 2024-07-30 17:27:05 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2301740]