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[ Upstream commit50670b6ee9] If md is NULL, tun_dst must be freed, otherwise it will cause memory leak. Fixes:1a66a836da("gre: add collect_md mode to ERSPAN tunnel") Cc: William Tu <u9012063@gmail.com> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>