[PATCH] ASoC: mediatek: mt8192: Check existence of dai_name before dereferencing

[Chen-Yu Tsai]

On Tue, Jan 9, 2024 at 4:47 AM Nícolas F. R. A. Prado
<nfraprado at collabora.com> wrote:
>
> Following commit 13f58267cda3 ("ASoC: soc.h: don't create dummy
> Component via COMP_DUMMY()"), the dai_name field is only populated for
> dummy components after the card is registered. This causes a null
> pointer dereference in the mt8192-mt6359 sound card driver's probe
> function when searching for a dai_name among all the card's dai links.
>
> Verify that the dai_name is non-null before passing it to strcmp. While
> at it, also check that there's at least one codec.
>
> Reported-by: "kernelci.org bot" <bot at kernelci.org>
> Closes: https://linux.kernelci.org/test/case/id/6582cd6d992645c680e13478/
> Fixes: 13f58267cda3 ("ASoC: soc.h: don't create dummy Component via COMP_DUMMY()")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado at collabora.com>

Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>
Tested-by: Chen-Yu Tsai <wenst at chromium.org>

Audio now works again on my MT8192 Hayato.