NETFILTER: xt_TCPMSS: remove network triggerable WARN_ON

[NETFILTER]: xt_TCPMSS: remove network triggerable WARN_ON

[ Upstream commit: 9dc0564e ]

ipv6_skip_exthdr() returns -1 for invalid packets. don't WARN_ON
that.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/netfilter/xt_TCPMSS.c

@@ -178,10 +178,8 @@ xt_tcpmss_target6(struct sk_buff **pskb,
 
 	nexthdr = ipv6h->nexthdr;
 	tcphoff = ipv6_skip_exthdr(*pskb, sizeof(*ipv6h), &nexthdr);
-	if (tcphoff < 0) {
-		WARN_ON(1);
+	if (tcphoff < 0)
 		return NF_DROP;
-	}
 	ret = tcpmss_mangle_packet(pskb, targinfo, tcphoff,
 				   sizeof(*ipv6h) + sizeof(struct tcphdr));
 	if (ret < 0)