diff options
| author | Bob Moore <robert.moore@intel.com> | 2013-08-08 15:29:58 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-08-13 13:14:15 +0200 |
| commit | a50abf4842dd7d603a2ad6dcc7f1467fd2a66f03 (patch) | |
| tree | e872ae70215498c551be7048c61cf4ea1c0b2233 /drivers/acpi/acpica/exoparg1.c | |
| parent | 1d82980c99ef2a91459ea39627d8114befb2c895 (diff) | |
| download | linux-a50abf4842dd7d603a2ad6dcc7f1467fd2a66f03.tar.bz2 | |
ACPICA: Return error if DerefOf resolves to a null package element.
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>
Diffstat (limited to 'drivers/acpi/acpica/exoparg1.c')
| -rw-r--r-- | drivers/acpi/acpica/exoparg1.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/exoparg1.c b/drivers/acpi/acpica/exoparg1.c index 3482df4a69f9..2cdd41d8ade6 100644 --- a/drivers/acpi/acpica/exoparg1.c +++ b/drivers/acpi/acpica/exoparg1.c @@ -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: |