mptcp: put subflow sock on connect error

mptcp_add_pending_subflow() performs a sock_hold() on the subflow,
then adds the subflow to the join list.

Without a sock_put the subflow sk won't be freed in case connect() fails.

unreferenced object 0xffff88810c03b100 (size 3000):
[..]
    sk_prot_alloc.isra.0+0x2f/0x110
    sk_alloc+0x5d/0xc20
    inet6_create+0x2b7/0xd30
    __sock_create+0x17f/0x410
    mptcp_subflow_create_socket+0xff/0x9c0
    __mptcp_subflow_connect+0x1da/0xaf0
    mptcp_pm_nl_work+0x6e0/0x1120
    mptcp_worker+0x508/0x9a0

Fixes: 5b950ff4331ddda ("mptcp: link MPC subflow into msk only after accept")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index e1fbcab..41695e2 100644 (file)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1297,6 +1297,7 @@ failed_unlink:
        spin_lock_bh(&msk->join_list_lock);
        list_del(&subflow->node);
        spin_unlock_bh(&msk->join_list_lock);
+       sock_put(mptcp_subflow_tcp_sock(subflow));
 
 failed:
        subflow->disposable = 1;