tar-1.29-extract-pathname-bypass.patch

--- a/lib/paxnames.c	2016-04-06 00:04:47.314860045 +0300
+++ b/lib/paxnames.c	2016-04-06 02:08:44.962297881 +0300
@@ -18,6 +18,7 @@
 #include <system.h>
 #include <hash.h>
 #include <paxlib.h>
+#include <quotearg.h>
 
 
 /* Hash tables of strings.  */
@@ -114,7 +115,15 @@
       for (p = file_name + prefix_len; *p; )
 	{
           if (p[0] == '.' && p[1] == '.' && (ISSLASH (p[2]) || !p[2]))
-	    prefix_len = p + 2 - file_name;
+            {
+	      static char const *const diagnostic[] =
+	      {
+		N_("%s: Member name contains '..'"),
+		N_("%s: Hard link target contains '..'")
+	      };
+	      ERROR ((0, 0, _(diagnostic[link_target]),
+	              quotearg_colon (file_name)));
+	    }
 
 	  do
 	    {