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Commit a274019f authored by Jiang Liu's avatar Jiang Liu Committed by Rafael J. Wysocki
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ACPI: Enforce stricter checks for address space descriptors 



Enforce stricter checks for address space descriptors according to
ACPI spec.

Signed-off-by: default avatarJiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent c78b6885

drivers/acpi/resource.c

+9 −0
Original line number Diff line number Diff line
@@ -192,6 +192,15 @@ static bool acpi_decode_space(struct resource *res, 
	bool wp = addr->info.mem.write_protect;

	u64 len = attr->address_length;



	/*

	 * Filter out invalid descriptor according to ACPI Spec 5.0, section

	 * 6.4.3.5 Address Space Resource Descriptors.

	 */

	if ((addr->min_address_fixed != addr->max_address_fixed && len) ||

	    (addr->min_address_fixed && addr->max_address_fixed && !len))

		pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",

			 addr->min_address_fixed, addr->max_address_fixed, len);



	res->start = attr->minimum;

	res->end = attr->maximum;