netfilter 02/04: ip6t_ipv6header: fix match on packets ending with NEXTHDR_NONE

[Patrick McHardy <kaber@trash.net>]

commit b98b4947cb79d670fceca0e951c092eea93e9baa
Author: Christoph Paasch <christoph.paasch@gmail.com>
Date:   Tue May 5 15:32:16 2009 +0200

    netfilter: ip6t_ipv6header: fix match on packets ending with NEXTHDR_NONE
    
    As packets ending with NEXTHDR_NONE don't have a last extension header,
    the check for the length needs to be after the check for NEXTHDR_NONE.
    
    Signed-off-by: Christoph Paasch <christoph.paasch@gmail.com>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/ipv6/netfilter/ip6t_ipv6header.c b/net/ipv6/netfilter/ip6t_ipv6header.c
index 14e6724..91490ad 100644
--- a/net/ipv6/netfilter/ip6t_ipv6header.c
+++ b/net/ipv6/netfilter/ip6t_ipv6header.c
@@ -50,14 +50,14 @@ ipv6header_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
 		struct ipv6_opt_hdr _hdr;
 		int hdrlen;
 
-		/* Is there enough space for the next ext header? */
-		if (len < (int)sizeof(struct ipv6_opt_hdr))
-			return false;
 		/* No more exthdr -> evaluate */
 		if (nexthdr == NEXTHDR_NONE) {
 			temp |= MASK_NONE;
 			break;
 		}
+		/* Is there enough space for the next ext header? */
+		if (len < (int)sizeof(struct ipv6_opt_hdr))
+			return false;
 		/* ESP -> evaluate */
 		if (nexthdr == NEXTHDR_ESP) {
 			temp |= MASK_ESP;