ip6_gre: fix potential memory leak in ip6erspan_rcv
If md is NULL, tun_dst must be freed, otherwise it will cause memory leak. Fixes: ef7baf5e ("ip6_gre: add ip6 erspan collect_md mode") Cc: William Tu <u9012063@gmail.com> Signed-off-by: NHaishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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