icmp: Don't leak original dst into ip_route_input()
ip_route_input() unconditionally overwrites the dst. Hide the original dst attached to the skb by calling skb_dst_set(skb, NULL) prior to ip_route_input(). Reported-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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