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

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Message-Id: <1420684386-5975-13-git-send-email-jiang.liu@linux.intel.com>
Date:	Thu,  8 Jan 2015 10:32:59 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [RFC Patch 12/19] ACPI: Enforce stricter checks for address space descriptors

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

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 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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