Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[pandora-kernel.git] / net / ipv6 / ipv6_sockglue.c

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index c042ce1..030c0c9 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -7,8 +7,6 @@
  *
  *     Based on linux/net/ipv4/ip_sockglue.c
  *
- *     $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
- *
  *     This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
  *      as published by the Free Software Foundation; either version
@@ -345,18 +343,21 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
        case IPV6_DSTOPTS:
        {
                struct ipv6_txoptions *opt;
+
+               /* remove any sticky options header with a zero option
+                * length, per RFC3542.
+                */
                if (optlen == 0)
                        optval = NULL;
+               else if (optlen < sizeof(struct ipv6_opt_hdr) ||
+                        optlen & 0x7 || optlen > 8 * 255)
+                       goto e_inval;
 
                /* hop-by-hop / destination options are privileged option */
                retv = -EPERM;
                if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
                        break;
 
-               if (optlen < sizeof(struct ipv6_opt_hdr) ||
-                   optlen & 0x7 || optlen > 8 * 255)
-                       goto e_inval;
-
                opt = ipv6_renew_options(sk, np->opt, optname,
                                         (struct ipv6_opt_hdr __user *)optval,
                                         optlen);