From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com

[ Upstream commit e51699505042fb365df3a0ce68b850ccd9ad0108 ]

We should have a limited trust in the BIOS and verify that the SSP index reported in NHLT is valid for each platform.

Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com Link: https://lore.kernel.org/r/20220725195343.145603-2-pierre-louis.bossart@linux... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/sof/intel/hda.c | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c index 9c97c80a7f48..b688caa34774 100644 --- a/sound/soc/sof/intel/hda.c +++ b/sound/soc/sof/intel/hda.c @@ -1375,6 +1375,7 @@ struct snd_soc_acpi_mach *hda_machine_select(struct snd_sof_dev *sdev)

if (mach->tplg_quirk_mask & SND_SOC_ACPI_TPLG_INTEL_SSP_NUMBER && mach->mach_params.i2s_link_mask) { + const struct sof_intel_dsp_desc *chip = get_chip_info(sdev->pdata); int ssp_num;

if (hweight_long(mach->mach_params.i2s_link_mask) > 1 && @@ -1384,6 +1385,12 @@ struct snd_soc_acpi_mach *hda_machine_select(struct snd_sof_dev *sdev) /* fls returns 1-based results, SSPs indices are 0-based */ ssp_num = fls(mach->mach_params.i2s_link_mask) - 1;

+ if (ssp_num >= chip->ssp_count) { + dev_err(sdev->dev, "Invalid SSP %d, max on this platform is %d\n", + ssp_num, chip->ssp_count); + return NULL; + } + tplg_filename = devm_kasprintf(sdev->dev, GFP_KERNEL, "%s%s%d", sof_pdata->tplg_filename,