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-rw-r--r--inet/inet6_rth.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/inet/inet6_rth.c b/inet/inet6_rth.c
index 15f8240909..e0fad339a9 100644
--- a/inet/inet6_rth.c
+++ b/inet/inet6_rth.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2006, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
 
@@ -93,6 +93,9 @@ inet6_rth_add (void *bp, const struct in6_addr *addr)
       struct ip6_rthdr0 *rthdr0;
     case IPV6_RTHDR_TYPE_0:
       rthdr0 = (struct ip6_rthdr0 *) rthdr;
+      if (rthdr0->ip6r0_len * 8 / sizeof (struct in6_addr)
+	  - rthdr0->ip6r0_segleft < 1)
+        return -1;
 
       memcpy (&rthdr0->ip6r0_addr[rthdr0->ip6r0_segleft++],
 	      addr, sizeof (struct in6_addr));