efivars: if OsIndicationsSupported does not exist, assume that reboot-to-firmware is not available

It's not advertised and hence not available. Fixes: #7424
2017-11-24 12:00:09 +01:00
parent e22c567fea
commit 846ab104ca
1 changed files with 2 additions and 0 deletions
@@ -119,6 +119,8 @@ int efi_reboot_to_firmware_supported(void) {
                return -EOPNOTSUPP;

        r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s);
+        if (r == -ENOENT) /* variable doesn't exist? it's not supported then */
+                return -EOPNOTSUPP;
        if (r < 0)
                return r;
        if (s != sizeof(uint64_t))