ip_gre: fix a possible crash in ipgre_err()
Another fix needed in ipgre_err(), as parse_gre_header() might change skb->head. Bug added in commit c5441932 (GRE: Refactor GRE tunneling code.) Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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