diff options
| author | Erik Schmauss <erik.schmauss@intel.com> | 2018-08-10 14:42:55 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-08-14 23:49:13 +0200 |
| commit | f016b19a9275089a2ab06c2144567c2ad8d5d6ad (patch) | |
| tree | b5db8e00588a5dc85c0d05c48f25583227884ab3 /drivers/acpi/acpica | |
| parent | d46b6537f0ceed303047da918ed951f074a99288 (diff) | |
ACPICA: ACPICA: add status check for acpi_hw_read before assigning return value
The value coming from acpi_hw_read() should not be used if it
returns an error code, so check the status returned by it before
using that value in two places in acpi_hw_register_read().
Reported-by: Mark Gross <mark.gross@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
| -rw-r--r-- | drivers/acpi/acpica/hwregs.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c index 3de794bcf8fa..69603ba52a3a 100644 --- a/drivers/acpi/acpica/hwregs.c +++ b/drivers/acpi/acpica/hwregs.c @@ -528,13 +528,18 @@ acpi_status acpi_hw_register_read(u32 register_id, u32 *return_value) status = acpi_hw_read(&value64, &acpi_gbl_FADT.xpm2_control_block); - value = (u32)value64; + if (ACPI_SUCCESS(status)) { + value = (u32)value64; + } break; case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ status = acpi_hw_read(&value64, &acpi_gbl_FADT.xpm_timer_block); - value = (u32)value64; + if (ACPI_SUCCESS(status)) { + value = (u32)value64; + } + break; case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |