diff options
| author | Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com> | 2017-11-07 13:46:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-11-08 21:56:21 +0300 |
| commit | 3b47c9dc75be097bc0e2f3ac4b176fbf3eed85f2 (patch) | |
| tree | 1274157fa5fea9715a5af8a2e57be3cd047f6704 /sound/soc/intel/skylake | |
| parent | f8e066521192c7debe59127d90abbe2773577e25 (diff) | |
| download | linux-3b47c9dc75be097bc0e2f3ac4b176fbf3eed85f2.tar.xz | |
ASoC: Intel: Skylake: Check for NHLT ACPI header signature
In certain buggy BIOS acpi_evaluate_dsm() may not return the correct
NHLT table, so check the NHLT table header signature before accessing
it.
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/intel/skylake')
| -rw-r--r-- | sound/soc/intel/skylake/skl-nhlt.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c index e7d766d56c8e..d14c50a60289 100644 --- a/sound/soc/intel/skylake/skl-nhlt.c +++ b/sound/soc/intel/skylake/skl-nhlt.c @@ -20,6 +20,8 @@ #include <linux/pci.h> #include "skl.h" +#define NHLT_ACPI_HEADER_SIG "NHLT" + /* Unique identification for getting NHLT blobs */ static guid_t osc_guid = GUID_INIT(0xA69F886E, 0x6CEB, 0x4594, @@ -45,6 +47,13 @@ struct nhlt_acpi_table *skl_nhlt_init(struct device *dev) memremap(nhlt_ptr->min_addr, nhlt_ptr->length, MEMREMAP_WB); ACPI_FREE(obj); + if (nhlt_table && (strncmp(nhlt_table->header.signature, + NHLT_ACPI_HEADER_SIG, + strlen(NHLT_ACPI_HEADER_SIG)) != 0)) { + memunmap(nhlt_table); + dev_err(dev, "NHLT ACPI header signature incorrect\n"); + return NULL; + } return nhlt_table; } |