[PATCH 6/6] dccp: Add check for truncated ICMPv6 DCCP error packets

[Gerrit Renker <gerrit@xxxxxxxxxxxxxx>]

From: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>

This patch adds a minimum-length check for ICMPv6 packets, to allow meaningful
DCCP sequence number checks, as per the previous patch for ICMPv4 payloads.

Signed-off-by: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
Acked-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
 net/dccp/ipv6.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -96,6 +96,11 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	__u64 seq;
 	struct net *net = dev_net(skb->dev);
 
+	if (skb->len < offset + __dccp_basic_hdr_len(dh)) {
+		ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
+		return;
+	}
+
 	sk = inet6_lookup(net, &dccp_hashinfo,
 			&hdr->daddr, dh->dccph_dport,
 			&hdr->saddr, dh->dccph_sport, inet6_iif(skb));
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