$NetBSD: patch-af,v 1.1 2002/11/20 16:57:55 bouyer Exp $
This is based on, tar-dots.patch from RedHat tar-1.13.25-4.7.1.src.rpm, and
http://www.security.nnov.ru/files/archive/tar-1.13.19.patch

--- src/misc.c.orig	Mon Nov 11 15:09:06 2002
+++ src/misc.c	Mon Nov 11 15:14:34 2002
@@ -203,17 +203,25 @@
 {
   char const *p = name + FILESYSTEM_PREFIX_LEN (name);
 
+  if (ISSLASH (*p)) return 1;
   for (;;)
     {
-      if (p[0] == '.' && p[1] == '.' && (ISSLASH (p[2]) || !p[2]))
+      if (p[0] == '.' && p[1] == '.' && (!p[2] || ISSLASH (p[2])))
 	return 1;
 
       do
 	{
-	  if (! *p++)
+	  if (! *p)
 	    return 0;
 	}
-      while (! ISSLASH (*p));
+      while (! ISSLASH (*p++));
+
+      do
+        {
+          if (! *p++)
+            return 0;
+        }
+      while ( ISSLASH (*p));
     }
 }