ACPI / APEI: fix error status check condition for CPER

In Table 18-289, ACPI5.0 SPEC, the error data length in CPER
Generic Error Data Entry can be 0, which means this generic
error data entry can have only one header. So fix the check
conditon for it.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Reviewed-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index 1e5d8a40101e274f5d6ce2bfe1a24a486a671af7..fefc2ca7cc3e0199b5f98b707107d424dd40b8eb 100644 (file)
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -405,7 +405,7 @@ int apei_estatus_check(const struct acpi_hest_generic_status *estatus)
                return rc;
        data_len = estatus->data_length;
        gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-       while (data_len > sizeof(*gdata)) {
+       while (data_len >= sizeof(*gdata)) {
                gedata_len = gdata->error_data_length;
                if (gedata_len > data_len - sizeof(*gdata))
                        return -EINVAL;