ipv6: mip6: fix mip6_mh_filter()

mip6_mh_filter() should not modify its input, or else its caller
would need to recompute ipv6_hdr() if skb->head is reallocated.

Use skb_header_pointer() instead of pskb_may_pull()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 5b087c31d87b54f5a2574903775b81692bcd2616..0f9bdc5ee9f38c70f1c4c265e8ebe43467d6b59a 100644 (file)
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -86,28 +86,30 @@ static int mip6_mh_len(int type)
 
 static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
 {
-       struct ip6_mh *mh;
+       struct ip6_mh _hdr;
+       const struct ip6_mh *mh;
 
-       if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) ||
-           !pskb_may_pull(skb, (skb_transport_offset(skb) +
-                                ((skb_transport_header(skb)[1] + 1) << 3))))
+       mh = skb_header_pointer(skb, skb_transport_offset(skb),
+                               sizeof(_hdr), &_hdr);
+       if (!mh)
                return -1;
 
-       mh = (struct ip6_mh *)skb_transport_header(skb);
+       if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len)
+               return -1;
 
        if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
                LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
                               mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type));
-               mip6_param_prob(skb, 0, ((&mh->ip6mh_hdrlen) -
-                                        skb_network_header(skb)));
+               mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) +
+                               skb_network_header_len(skb));
                return -1;
        }
 
        if (mh->ip6mh_proto != IPPROTO_NONE) {
                LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
                               mh->ip6mh_proto);
-               mip6_param_prob(skb, 0, ((&mh->ip6mh_proto) -
-                                        skb_network_header(skb)));
+               mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) +
+                               skb_network_header_len(skb));
                return -1;
        }