[PATCH 1/3] ASoC: SOF: Intel: hda: add sanity check on SSP index reported by NHLT

[Pierre-Louis Bossart]

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 at linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao at linux.intel.com>
---
 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 d337d55050e2..8639ea63a10d 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -1527,6 +1527,7 @@ struct snd_soc_acpi_mach *hda_machine_select(struct snd_sof_dev *sdev)
 		if (tplg_fixup &&
 		    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 &&
@@ -1536,6 +1537,12 @@ 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,
-- 
2.34.1