--- tar-1.13.25/src/tar.c    2001-09-21 02:11:27.000000000 +0200
+++ tar-1.13.25/src/tar.c    2002-06-16 18:19:04.000000000 +0200
@@ -534,7 +534,7 @@
       /* Allocate a new argument array, and copy program name in it.  */
 
       new_argc = argc - 1 + strlen (argv[1]);
-      new_argv = xmalloc (new_argc * sizeof (char *));
+      new_argv = xmalloc ((new_argc + 1) * sizeof (char *));
       in = argv;
       out = new_argv;
       *out++ = *in++;
@@ -562,6 +562,10 @@
       while (in < argv + argc)
        *out++ = *in++;
 
+      /* K&R standard requires a NULL termination */
+
+      *out = NULL;
+
       /* Replace the old option list by the new one.  */
 
       argc = new_argc;