[PATCH 3.18 02/36] ipv6: release dst on error in ip6_dst_lookup_tail

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Willem de Bruijn <will...@google.com>

commit 00ea1ceebe0d9f2dc1cc2b7bd575a00100c27869 upstream.

If ip6_dst_lookup_tail has acquired a dst and fails the IPv4-mapped
check, release the dst before returning an error.

Fixes: ec5e3b0a1d41 ("ipv6: Inhibit IPv4-mapped src address on the wire.")
Signed-off-by: Willem de Bruijn <will...@google.com>
Acked-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Cc: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/ipv6/ip6_output.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -961,8 +961,10 @@ static int ip6_dst_lookup_tail(struct so
        }
 #endif
        if (ipv6_addr_v4mapped(&fl6->saddr) &&
-           !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr)))
-               return -EAFNOSUPPORT;
+           !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) {
+               err = -EAFNOSUPPORT;
+               goto out_err_release;
+       }
 
        return 0;