grub2/0419-grub-core-normal-main.c-Fix-freed-memory-dereference.patch

From c62405b0f7b966a7efb3642b3db14469d9b82ba8 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Sat, 4 May 2013 13:50:16 +0200
Subject: [PATCH 419/482] 	* grub-core/normal/main.c: Fix freed memory
 dereference.

---
 ChangeLog               |  4 ++++
 grub-core/normal/main.c | 13 ++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 47f06fd..16456f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2013-05-04  Vladimir Serbinenko  <phcoder@gmail.com>
 
+	* grub-core/normal/main.c: Fix freed memory dereference.
+
+2013-05-04  Vladimir Serbinenko  <phcoder@gmail.com>
+
 	Fix several memory leaks.
 
 2013-05-04  Vladimir Serbinenko  <phcoder@gmail.com>
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index f7a815f..ffc2cd2 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -163,8 +163,9 @@ static grub_menu_t
 read_config_file (const char *config)
 {
   grub_file_t file;
-  const char *old_file, *old_dir;
+  char *old_file = 0, *old_dir = 0;
   char *config_dir, *ptr = 0;
+  const char *ctmp;
 
   grub_menu_t newmenu;
 
@@ -183,8 +184,12 @@ read_config_file (const char *config)
   if (! file)
     return 0;
 
-  old_file = grub_env_get ("config_file");
-  old_dir = grub_env_get ("config_directory");
+  ctmp = grub_env_get ("config_file");
+  if (ctmp)
+    old_file = grub_strdup (ctmp);
+  ctmp = grub_env_get ("config_directory");
+  if (ctmp)
+    old_dir = grub_strdup (ctmp);
   grub_env_set ("config_file", config);
   config_dir = grub_strdup (config);
   if (config_dir)
@@ -220,6 +225,8 @@ read_config_file (const char *config)
     grub_env_set ("config_directory", old_dir);
   else
     grub_env_unset ("config_directory");
+  grub_free (old_file);
+  grub_free (old_dir);
 
   grub_file_close (file);
 
-- 
1.8.2.1