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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>
hifive-unleashed-5.1
Jarno Rajahalme 2014-02-15 17:37:45 -08:00 committed by Jesse Gross
parent 3c7eacfc8a
commit 04382a3303
1 changed files with 1 additions and 0 deletions
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net/openvswitch/flow.c
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@ -73,6 +73,7 @@ void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
if ((flow->key.eth.type == htons(ETH_P_IP) ||
flow->key.eth.type == htons(ETH_P_IPV6)) &&
flow->key.ip.frag != OVS_FRAG_TYPE_LATER &&
flow->key.ip.proto == IPPROTO_TCP &&
likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));