[Patch v2 12/23] 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 |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 5bf73a9f26d9..57891a621b96 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -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;
 
-- 
1.7.10.4

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