From f016b19a9275089a2ab06c2144567c2ad8d5d6ad Mon Sep 17 00:00:00 2001 From: Erik Schmauss Date: Fri, 10 Aug 2018 14:42:55 -0700 Subject: [PATCH] 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 Signed-off-by: Erik Schmauss [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/hwregs.c | 9 +++++++-- 1 file 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 */