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This patch fix dst reference counting in tcp_v6_send_synack
Analysis:
Currently tcp_v6_send_synack is never called with a dst entry
so dst always comes in as NULL.
ip6_dst_lookup calls ip6_route_output which calls dst_hold
before it returns the dst entry. Neither xfrm_lookup
nor tcp_make_synack consume the dst entry so we still have
a dst_entry with a bumped refrence count at the end of
this function.
Therefore we need to call dst_release just before we return
just like tcp_v4_send_synack does.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
78b910429e