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ASoC: mediatek: mt8192: Check existence of dai_name before dereferencing

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Following commit 13f58267cd ("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@kernelci.org>
Closes: https://linux.kernelci.org/test/case/id/6582cd6d992645c680e13478/
Fixes: 13f58267cd ("ASoC: soc.h: don't create dummy Component via COMP_DUMMY()")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://msgid.link/r/20240108204508.691739-1-nfraprado@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Nícolas F. R. A. Prado 2024-01-08 17:44:58 -03:00 committed by Mark Brown
parent 3ec71290db
commit 4d4e1b6319
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 1 deletions
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3
sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c
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@ -1208,7 +1208,8 @@ static int mt8192_mt6359_dev_probe(struct platform_device *pdev)
dai_link->ignore = 0;
}
if (strcmp(dai_link->codecs[0].dai_name, RT1015_CODEC_DAI) == 0)
if (dai_link->num_codecs && dai_link->codecs[0].dai_name &&
strcmp(dai_link->codecs[0].dai_name, RT1015_CODEC_DAI) == 0)
dai_link->ops = &mt8192_rt1015_i2s_ops;
if (!dai_link->platforms->name)