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ACPICA: ACPICA: add status check for acpi_hw_read before assigning return value

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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 <[email protected]>
Signed-off-by: Erik Schmauss <[email protected]>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Erik Schmauss 2018-08-10 14:42:55 -07:00 • committed by Rafael J. Wysocki
commit f016b19a92
1 changed files with 7 additions and 2 deletions
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9
drivers/acpi/acpica/hwregs.c
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@ -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 */