From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 23 Nov 2017 21:05:46 +0000 (+0100)
Subject: efivars: if OsIndicationsSupported does not exist, assume that reboot-to-firmware... 
X-Git-Tag: v236~125^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F7446%2Fhead;p=thirdparty%2Fsystemd.git

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

It's not advertised and hence not available.

Fixes: #7424
---

diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index cf2966fd5cb..9ca51cf7507 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -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))