[IPV6]: Ensure to have hop-by-hop options in our header of &sk_buff.
Signed-off-by: YOSHIFUJI Hideaki <[EMAIL PROTECTED]>
---
net/ipv6/exthdrs.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
7bcedcc73a45a5577103422c33e01f1633173984
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 2a1e7e4..d88cab7 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -489,6 +489,18 @@ int ipv6_parse_hopopts(struct sk_buff *s
{
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;
--
1.0.8
--
YOSHIFUJI Hideaki @ USAGI Project <[EMAIL PROTECTED]>
GPG-FP : 9022 65EB 1ECF 3AD1 0BDF 80D8 4807 F894 E062 0EEA
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