[U-Boot] [PATCH 1/1] efi_loader: handling NULL in efi_convert_device_path_to_text

[Heinrich Schuchardt]

According to the UEFI spec we have to return NULL if the device
path argument is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 lib/efi_loader/efi_device_path_to_text.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index 3a9d5e4122..55007a527d 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -241,12 +241,14 @@ static uint16_t EFIAPI *efi_convert_device_path_to_text(
 		bool display_only,
 		bool allow_shortcuts)
 {
-	uint16_t *text;
+	uint16_t *text = NULL;
 	char buffer[MAX_PATH_LEN];
 	char *str = buffer;
 
 	EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts);
 
+	if (!device_path)
+		goto out;
 	while (device_path &&
 	       str + MAX_NODE_LEN < buffer + MAX_PATH_LEN) {
 		*str++ = '/';
@@ -256,6 +258,7 @@ static uint16_t EFIAPI *efi_convert_device_path_to_text(
 
 	text = efi_str_to_u16(buffer);
 
+out:
 	EFI_EXIT(EFI_SUCCESS);
 	return text;
 }
-- 
2.14.2