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ACPICA: Return error if DerefOf resolves to a null package element.

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Disallow the dereference of a reference (via index) to an uninitialized
package element. Provides compatibility with other ACPI
implementations. ACPICA BZ 1003.

References: https://bugs.acpica.org/show_bug.cgi?id=431
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 2013-08-08 15:29:58 +08:00 committed by Rafael J. Wysocki
parent 1d82980c99
commit a50abf4842
1 changed files with 10 additions and 3 deletions
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13
drivers/acpi/acpica/exoparg1.c
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@ -962,10 +962,17 @@ acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
*/
return_desc =
*(operand[0]->reference.where);
if (return_desc) {
acpi_ut_add_reference
(return_desc);
if (!return_desc) {
/*
* Element is NULL, do not allow the dereference.
* This provides compatibility with other ACPI
* implementations.
*/
return_ACPI_STATUS
(AE_AML_UNINITIALIZED_ELEMENT);
}
acpi_ut_add_reference(return_desc);
break;
default: