[IPV6] tcp_v6_send_synack: release the destination
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>
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 66d0400..ca9cf685 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -515,6 +515,7 @@
done:
if (opt && opt != np->opt)
sock_kfree_s(sk, opt, opt->tot_len);
+ dst_release(dst);
return err;
}