openvswitch: Read tcp flags only then the tranport header is present.
Only the first IP fragment can have a TCP header, check for this. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
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@ -73,6 +73,7 @@ void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
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if ((flow->key.eth.type == htons(ETH_P_IP) ||
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flow->key.eth.type == htons(ETH_P_IPV6)) &&
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flow->key.ip.frag != OVS_FRAG_TYPE_LATER &&
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flow->key.ip.proto == IPPROTO_TCP &&
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likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
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tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
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