CVE-2024-46793 (GCVE-0-2024-46793)
Vulnerability from cvelistv5
Published
2024-09-18 07:12
Modified
2025-05-04 09:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: Intel: Boards: Fix NULL pointer deref in BYT/CHT boards harder Since commit 13f58267cda3 ("ASoC: soc.h: don't create dummy Component via COMP_DUMMY()") dummy codecs declared like this: SND_SOC_DAILINK_DEF(dummy, DAILINK_COMP_ARRAY(COMP_DUMMY())); expand to: static struct snd_soc_dai_link_component dummy[] = { }; Which means that dummy is a zero sized array and thus dais[i].codecs should not be dereferenced *at all* since it points to the address of the next variable stored in the data section as the "dummy" variable has an address but no size, so even dereferencing dais[0] is already an out of bounds array reference. Which means that the if (dais[i].codecs->name) check added in commit 7d99a70b6595 ("ASoC: Intel: Boards: Fix NULL pointer deref in BYT/CHT boards") relies on that the part of the next variable which the name member maps to just happens to be NULL. Which apparently so far it usually is, except when it isn't and then it results in crashes like this one: [ 28.795659] BUG: unable to handle page fault for address: 0000000000030011 ... [ 28.795780] Call Trace: [ 28.795787] <TASK> ... [ 28.795862] ? strcmp+0x18/0x40 [ 28.795872] 0xffffffffc150c605 [ 28.795887] platform_probe+0x40/0xa0 ... [ 28.795979] ? __pfx_init_module+0x10/0x10 [snd_soc_sst_bytcr_wm5102] Really fix things this time around by checking dais.num_codecs != 0.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0cc65482f5b03ac2b1c240bc34665e43ea2d71bbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85cda5b040bda9c577b34eb72d5b2e5b7e31985cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 7d99a70b65951108d82e1618c67abe69c3ed7720
Version: 7d99a70b65951108d82e1618c67abe69c3ed7720
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   Linux Linux Version: 6.8
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Esto significa que la comprobaci\u00f3n if (dais[i].codecs-\u0026gt;name) a\u00f1adida en el commit 7d99a70b6595 (\\\"ASoC: Intel: Boards: Fix NULL pointer deref in BYT/CHT boards\\\") se basa en que la parte de la siguiente variable a la que se asigna el miembro name resulta ser NULL. Lo que aparentemente hasta ahora suele ser as\u00ed, excepto cuando no lo es y entonces da como resultado fallos como este: [ 28.795659] ERROR: no se puede gestionar la falla de p\u00e1gina para la direcci\u00f3n: 0000000000030011 ... [ 28.795780] Seguimiento de llamadas: [ 28.795787]  ... [ 28.795862] ? strcmp+0x18/0x40 [ 28.795872] 0xffffffffc150c605 [ 28.795887] platform_probe+0x40/0xa0 ... 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