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acpi/nfit: Block function zero DSMs

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In preparation for using function number 0 as an error value, prevent it
from being considered a valid function value by acpi_nfit_ctl().

Cc: <stable@vger.kernel.org>
Cc: stuart hayes <stuart.w.hayes@gmail.com>
Fixes: e02fb7264d ("nfit: add Microsoft NVDIMM DSM command set...")
Reported-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2019-01-14 14:07:19 -08:00
parent 1cd7386549
commit 5e9e38d0db
1 changed files with 7 additions and 0 deletions
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7
drivers/acpi/nfit/core.c
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@ -1867,6 +1867,13 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
return 0;
}
/*
* Function 0 is the command interrogation function, don't
* export it to potential userspace use, and enable it to be
* used as an error value in acpi_nfit_ctl().
*/
dsm_mask &= ~1UL;
guid = to_nfit_uuid(nfit_mem->family);
for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
if (acpi_check_dsm(adev_dimm->handle, guid,