[U-Boot] [PATCH for 2018.05 5/8] efi_loader: correctly determine length of empty device path

[Heinrich Schuchardt]

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 at gmx.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 531a754427..46d3fea732 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);
-- 
2.14.2