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authorMark Pearson <markpearson@lenovo.com>2021-03-02 17:10:03 +0300
committerTakashi Iwai <tiwai@suse.de>2021-03-04 11:14:36 +0300
commita14a6219996ee6f6e858d83b11affc7907633687 (patch)
treef2be6d7f844f3c2ffe3d97457f8f09da7a98c49c /sound/hda/intel-nhlt.c
parent9799110825dba087c2bdce886977cf84dada2005 (diff)
downloadlinux-a14a6219996ee6f6e858d83b11affc7907633687.tar.xz
ALSA: hda: ignore invalid NHLT table
On some Lenovo systems if the microphone is disabled in the BIOS only the NHLT table header is created, with no data. This means the endpoints field is not correctly set to zero - leading to an unintialised variable and hence invalid descriptors are parsed leading to page faults. The Lenovo firmware team is addressing this, but adding a check preventing invalid tables being parsed is worthwhile. Tested on a Lenovo T14. Tested-by: Philipp Leskovitz <philipp.leskovitz@secunet.com> Reported-by: Philipp Leskovitz <philipp.leskovitz@secunet.com> Signed-off-by: Mark Pearson <markpearson@lenovo.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20210302141003.7342-1-markpearson@lenovo.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/intel-nhlt.c')
-rw-r--r--sound/hda/intel-nhlt.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
index d053beccfaec..e2237239d922 100644
--- a/sound/hda/intel-nhlt.c
+++ b/sound/hda/intel-nhlt.c
@@ -39,6 +39,11 @@ int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
if (!nhlt)
return 0;
+ if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
+ dev_warn(dev, "Invalid DMIC description table\n");
+ return 0;
+ }
+
for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) {