[PATCH 2.4 8/10]: fixes for ip6t_multiport

[Yasuyuki Kozakai]

This patch fixes following bugs in ip6t_multiport.c,

	- missing check the size of the preference data.
	- IP6T_INV_PROTO should check with not ip->flags but ip->invflags.

Signed-off-by: Yasuyuki KOZAKAI <yasuyuki.kozakai at toshiba.co.jp>

-----------------------------------------------------------------
Yasuyuki KOZAKAI @ USAGI Project <yasuyuki.kozakai at toshiba.co.jp>

-------------- next part --------------
--- linux-2.4.28-rc1/./net/ipv6/netfilter/ip6t_multiport.c	2001-10-31 08:08:12.000000000 +0900
+++ linux-2.4.28-rc1-extfix/./net/ipv6/netfilter/ip6t_multiport.c	2004-11-10 00:51:45.000000000 +0900
@@ -74,9 +74,12 @@ checkentry(const char *tablename,
 {
 	const struct ip6t_multiport *multiinfo = matchinfo;
 
+	if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_multiport)))
+		return 0;
+
 	/* Must specify proto == TCP/UDP, no unknown flags or bad count */
 	return (ip->proto == IPPROTO_TCP || ip->proto == IPPROTO_UDP)
-		&& !(ip->flags & IP6T_INV_PROTO)
+		&& !(ip->invflags & IP6T_INV_PROTO)
 		&& matchsize == IP6T_ALIGN(sizeof(struct ip6t_multiport))
 		&& (multiinfo->flags == IP6T_MULTIPORT_SOURCE
 		    || multiinfo->flags == IP6T_MULTIPORT_DESTINATION