[IPV6]: Do not update MTU by invalid value in RA message.

Noticed by HIroaki Kago <kago@jp.fujitsu.com>

[IPV6]: Do not update MTU by invalid value in RA message.
Noticed by HIroaki Kago <kago@jp.fujitsu.com>
b1dd647f · Hideaki Yoshifuji · David S. Miller · 8bef6ab3 · b1dd647f
Commit b1dd647f authored Dec 24, 2003 by Hideaki Yoshifuji Committed by David S. Miller Dec 24, 2003
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net/ipv6/ndisc.c net/ipv6/ndisc.c +1 -3

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--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1166,9 +1166,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 				ND_PRINTK0("NDISC: router announcement with mtu = %d\n",
 					   mtu);
 			}
-		}
+		} else if (in6_dev->cnf.mtu6 != mtu) {
-		if (in6_dev->cnf.mtu6 != mtu) {
 			in6_dev->cnf.mtu6 = mtu;
 			if (rt)