efi_loader: fix efi_convert_device_path_to_text()

Ensure that the string we convert to UTF-16 is NUL terminated even
if the device path only contains end nodes.

Fixes: 3dc2c11e2c24 ("efi_loader: multi part device paths to text")
Addresses-Coverity: 350434 ("Uninitialized scalar variable")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index 4d73954ef89e8568c4e7cf5ce9f2eb0b3d92467e..6c428ee061f54d5d5dea7d25376bb807da59386d 100644 (file)
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -432,6 +432,7 @@ static uint16_t EFIAPI *efi_convert_device_path_to_text(
                *(u8 **)&device_path += device_path->length;
        }
 
+       *str = 0;
        text = efi_str_to_u16(buffer);
 
 out: