linux-kernel - [PATCH] x86: check boundary in count/setup_resource called by get_current

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Message-id: <200711010120.30410.yinghai.lu@sun.com>
Date:	Thu, 01 Nov 2007 01:20:29 -0700
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Gary Hade <gary.hade@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: check boundary in count/setup_resource called by
 get_current_resources

[PATCH] x86: check boundary in count/setup_resource called by get_current_resources

need to check info->res_num less than PCI_BUS_NUM_RESOURCES, so
info->bus->resource[info->res_num] = res will not beyond of bus resource array
when acpi resutrn too many resource entries.

Signed-off-by: Yinghai Lu <yinghai.lu@....com>

Index: linux-2.6/arch/x86/pci/acpi.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/acpi.c
+++ linux-2.6/arch/x86/pci/acpi.c
@@ -77,9 +77,13 @@ count_resource(struct acpi_resource *acp
 	struct acpi_resource_address64 addr;
 	acpi_status status;
 
+	if (info->res_num >= PCI_BUS_NUM_RESOURCES)
+		return AE_OK;
+
 	status = resource_to_addr(acpi_res, &addr);
 	if (ACPI_SUCCESS(status))
 		info->res_num++;
+
 	return AE_OK;
 }
 
@@ -93,6 +97,9 @@ setup_resource(struct acpi_resource *acp
 	unsigned long flags;
 	struct resource *root;
 
+	if (info->res_num >= PCI_BUS_NUM_RESOURCES)
+		return AE_OK;
+
 	status = resource_to_addr(acpi_res, &addr);
 	if (!ACPI_SUCCESS(status))
 		return AE_OK;
 
-
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