From: Bob Moore Date: Wed, 26 Feb 2014 02:30:25 +0000 (+0800) Subject: ACPICA: Harden _PRT repair code; check for minimum package length. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c3c2a545dc06e606c6cbbcb7ab722bf3b2cb668;p=linux-beck.git 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 Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/acpica/nsrepair2.c b/drivers/acpi/acpica/nsrepair2.c index 53b4b42a13f2..c57cd4aa357d 100644 --- a/drivers/acpi/acpica/nsrepair2.c +++ b/drivers/acpi/acpica/nsrepair2.c @@ -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)