netfilter 29/31: ip6t_eui: fix read outside array bounds

[Patrick McHardy <kaber@trash.net>]

commit 488908696971c5ea1dcc5d13f29c158ba4f6ae7d
Author: Patrick McHardy <kaber@trash.net>
Date:   Mon Aug 31 15:30:31 2009 +0200

    netfilter: ip6t_eui: fix read outside array bounds
    
    Use memcmp() instead of open coded comparison that reads one byte past
    the intended end.
    
    Based on patch from Roel Kluin <roel.kluin@gmail.com>
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/ipv6/netfilter/ip6t_eui64.c b/net/ipv6/netfilter/ip6t_eui64.c
index db610ba..ca287f6 100644
--- a/net/ipv6/netfilter/ip6t_eui64.c
+++ b/net/ipv6/netfilter/ip6t_eui64.c
@@ -23,7 +23,6 @@ static bool
 eui64_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
 {
 	unsigned char eui64[8];
-	int i = 0;
 
 	if (!(skb_mac_header(skb) >= skb->head &&
 	      skb_mac_header(skb) + ETH_HLEN <= skb->data) &&
@@ -42,12 +41,8 @@ eui64_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
 			eui64[4] = 0xfe;
 			eui64[0] ^= 0x02;
 
-			i = 0;
-			while (ipv6_hdr(skb)->saddr.s6_addr[8 + i] == eui64[i]
-			       && i < 8)
-				i++;
-
-			if (i == 8)
+			if (!memcmp(ipv6_hdr(skb)->saddr.s6_addr + 8, eui64,
+				    sizeof(eui64)))
 				return true;
 		}
 	}