Commit 5e9e38d0 authored Jan 14, 2019 by Dan Williams

acpi/nfit: Block function zero DSMs

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: e02fb726 ("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>

parent 1cd73865

drivers/acpi/nfit/core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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,