x86: check boundary in count setup resource

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 returns too many resource entries.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Gary Hade <gary.hade@us.ibm.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 2d88f7c6d6ac..7e35078673a4 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -77,6 +77,9 @@ count_resource(struct acpi_resource *acpi_res, void *data)
         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++;
@@ -93,6 +96,9 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
         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;