updated for version 7.3.589

Problem:    Crash when $HOME is not set.
Solution:   Check for a NULL pointer. (Chris Webb)

Author: brammool

src/misc1.c

@@ -4496,8 +4496,12 @@ home_replace(buf, src, dst, dstlen, one)
 #else
     homedir_env_orig = homedir_env = mch_getenv((char_u *)"HOME");
 #endif
+    /* Empty is the same as not set. */
+    if (homedir_env != NULL && *homedir_env == NUL)
+	homedir_env = NULL;
+
 #if defined(FEAT_MODIFY_FNAME) || defined(WIN3264)
-    if (vim_strchr(homedir_env, '~') != NULL)
+    if (homedir_env != NULL && vim_strchr(homedir_env, '~') != NULL)
     {
 	int	usedlen = 0;
 	int	flen;
@@ -4513,8 +4517,6 @@ home_replace(buf, src, dst, dstlen, one)
     }
 #endif
 
-    if (homedir_env != NULL && *homedir_env == NUL)
-	homedir_env = NULL;
     if (homedir_env != NULL)
 	envlen = STRLEN(homedir_env);
 

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    589,
 /**/
     588,
 /**/