Bug 5391

Summary:	Unexpectedly CopyObject of immediately passed Index reference is not reference
Product:	ACPI	Reporter:	Valery A Podrezov (Valery.A.Podrezov)
Component:	ACPICA-Core	Assignee:	Lin Ming (ming.m.lin)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	acpi-bugzilla
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	ASL code to reproduce bug. proposed patch

Description Valery A Podrezov 2005-10-07 08:13:42 UTC

Most recent kernel where this bug did not occur:
Distribution:
Hardware Environment:
Software Environment:
Problem Description:

The Linux kernel ACPI interpreter fails the following
AML test when it is compiled into a simulator. So if an
OEM BIOS includes this code, Linux would fail.

Steps to reproduce:

Run interpreter with the .asl demo code attached below.

Comment 1 Valery A Podrezov 2005-10-07 08:15:59 UTC

Created attachment 6253 [details]
ASL code to reproduce bug.

The demo program shows that actually the result of CopyObject
operation applied to the immediately passed Index reference is
not reference as expected but the object referred itself.

INTERNAL BUG NUMBER

   127

Comment 2 Lin Ming 2007-11-06 20:19:26 UTC

Created attachment 13430 [details]
proposed patch

Have tested aginst ASLTS, no regression

If method call or CopyObject - leave the Reference on the stack

Comment 3 Len Brown 2008-04-30 20:50:30 UTC

shipped in linux-2.6.25-git16
1cb2ef6606e0abd8565f66b5f95267de1b390694
ACPICA: Fixed a problem with CopyObject used in conjunction with the Index operator