From ec6700958a776a83681ecb11239c0525730c42ba Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Tue, 18 Apr 2006 14:46:26 -0700 Subject: [PATCH] [IPV6]: Ensure to have hop-by-hop options in our header of &sk_buff. Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/ipv6/exthdrs.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 2a1e7e45b890..d88cab7b973f 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -489,6 +489,18 @@ int ipv6_parse_hopopts(struct sk_buff *skb, int nhoff) { struct inet6_skb_parm *opt = IP6CB(skb); + /* + * skb->nh.raw is equal to skb->data, and + * skb->h.raw - skb->nh.raw is always equal to + * sizeof(struct ipv6hdr) by definition of + * hop-by-hop options. + */ + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || + !pskb_may_pull(skb, sizeof(struct ipv6hdr) + ((skb->h.raw[1] + 1) << 3))) { + kfree_skb(skb); + return -1; + } + opt->hop = sizeof(struct ipv6hdr); if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { skb->h.raw += (skb->h.raw[1]+1)<<3; -- 2.30.2