From adb575124d717b57bb2abb9e63875cb23601c44b Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Mon, 16 Apr 2018 07:59:07 +0200
Subject: [PATCH] efi_loader: correctly determine length of empty device path

efi_dp_size() is meant to return the device path length without the end
node.

The length of a device path containing only an end node was incorrectly
reported as 4.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 lib/efi_loader/efi_device_path.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 9b4d9ae0ab..a2e48851d7 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -234,6 +234,8 @@ unsigned efi_dp_size(const struct efi_device_path *dp)
 {
 	unsigned sz = 0;
 
+	if (!dp || dp->type == DEVICE_PATH_TYPE_END)
+		return 0;
 	while (dp) {
 		sz += dp->length;
 		dp = efi_dp_next(dp);