From 9cd7ef8703bc92b16c598f3d4a94793a48372974 Mon Sep 17 00:00:00 2001
From: Sascha Tommasone <sascha@tommasone.me>
Date: Sat, 6 Jul 2024 16:02:26 +0200
Subject: [PATCH] [Assignment-7] .

---
 7-SGX_Hands-on/src/app/embedded_device.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/7-SGX_Hands-on/src/app/embedded_device.c b/7-SGX_Hands-on/src/app/embedded_device.c
index f6fcce0..c4782cd 100644
--- a/7-SGX_Hands-on/src/app/embedded_device.c
+++ b/7-SGX_Hands-on/src/app/embedded_device.c
@@ -27,6 +27,7 @@ static void syntax_exit() {
 static EVP_PKEY *read_public_key(uint8_t *public_key_file, EVP_PKEY **key) {
     if(public_key_file == NULL) {
         fprintf(stderr, "public_key_file is a null pointer!\n");
+        return NULL;
     }
 
     FILE *fd = fopen(public_key_file, "rb");
@@ -44,11 +45,13 @@ static EVP_PKEY *read_public_key(uint8_t *public_key_file, EVP_PKEY **key) {
 static void hash_firmware(uint8_t *firmware_path, EVP_MD_CTX **ctx) {
     if(firmware_path == NULL) {
         fprintf(stderr, "firmware_path is a null pointer!\n");
+        return;
     }
 
     FILE *fd = fopen(firmware_path, "rb");
     if(fd == NULL) {
         fprintf(stderr, "failed to open firmware!\n");
+        goto exit;
     }
 
     size_t size;
@@ -56,8 +59,8 @@ static void hash_firmware(uint8_t *firmware_path, EVP_MD_CTX **ctx) {
     while((size = fread(buf, 1, BUFSIZE, fd)) != 0) {
         EVP_DigestVerifyUpdate(*ctx, buf, size);
     }
-
-    fclose(fd);
+    
+    exit: fclose(fd);
 }
 
 static void read_signature(uint8_t *signature, size_t *signature_size) {