[RFC Patch 12/19] ACPI: Enforce stricter checks for address space descriptors

[Jiang Liu]

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

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 drivers/acpi/resource.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 26b47f1da523..e82149e44347 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -192,6 +192,14 @@ static bool acpi_decode_space(struct resource *res,
 	bool wp = base->info.mem.write_protect;
 	u64 len = addr->address_length;
 
+	/*
+	 * Filter out invalid descriptor according to ACPI Spec 5.0, section
+	 * 6.4.3.5 Address Space Resource Descriptors.
+	 */
+	if ((base->min_address_fixed != base->max_address_fixed && len) ||
+	    (base->min_address_fixed && base->max_address_fixed && !len))
+		return false;
+
 	res->start = addr->minimum;
 	res->end = addr->maximum;
 
-- 
1.7.10.4

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