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bridge: Pull ip header into skb->data before looking into ip header.

If lower layer driver leaves the ip header in the skb fragment, it needs to
be first pulled into skb->data before inspecting ip header length or ip version
number.

Signed-off-by: Sarveshwar Bandi <sarveshwar.bandi@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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1 parent 435f08a commit 6caab7b0544e83e6c160b5e80f5a4a7dd69545c7 Sarveshwar Bandi committed with davem330 Oct 10, 2012
Showing with 3 additions and 0 deletions.
  1. +3 −0 net/bridge/br_netfilter.c
@@ -265,6 +265,9 @@ static int br_parse_ip_options(struct sk_buff *skb)
struct net_device *dev = skb->dev;
u32 len;
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto inhdr_error;
+
iph = ip_hdr(skb);
opt = &(IPCB(skb)->opt);

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