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ACPICA: Harden _PRT repair code; check for minimum package length. 

This change prevents a fault during the repair by checking up
front if the _PRT subpackage contains the minimum number of
elements (4).

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bob Moore 2014-02-26 10:30:25 +08:00 committed by Rafael J. Wysocki
parent 61db45ca21
commit 1c3c2a545d
1 changed files with 7 additions and 1 deletions
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8
drivers/acpi/acpica/nsrepair2.c
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@ -611,6 +611,7 @@ acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
union acpi_operand_object **top_object_list;
union acpi_operand_object **sub_object_list;
union acpi_operand_object *obj_desc;
union acpi_operand_object *sub_package;
u32 element_count;
u32 index;
@ -620,7 +621,12 @@ acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
element_count = package_object->package.count;
for (index = 0; index < element_count; index++) {
sub_object_list = (*top_object_list)->package.elements;
sub_package = *top_object_list;
sub_object_list = sub_package->package.elements;
if (sub_package->package.count < 4) { /* Minimum required element count */
return (AE_OK);
}
/*
* If the BIOS has erroneously reversed the _PRT source_name (index 2)