Eric Dumazet 22251c73ca ip_gre: fix a possible crash in parse_gre_header()
pskb_may_pull() can change skb->head, so we must init iph/greh after
calling it.

Bug added in commit c54419321455 (GRE: Refactor GRE tunneling code.)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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