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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2006-04-18 14:46:26 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-04-18 15:57:50 -0700
commitec6700958a776a83681ecb11239c0525730c42ba (patch)
tree07e6953adb8dab01b9e6c7415c886c124cefa541 /net/ipv6/exthdrs.c
parentef5cb9738b488140eb6c3f32fffab08f39a4905e (diff)
downloadlwn-ec6700958a776a83681ecb11239c0525730c42ba.tar.gz
lwn-ec6700958a776a83681ecb11239c0525730c42ba.zip
[IPV6]: Ensure to have hop-by-hop options in our header of &sk_buff.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/exthdrs.c')
-rw-r--r--net/ipv6/exthdrs.c12
1 files changed, 12 insertions, 0 deletions
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;