rds: tcp: use sock_create_lite() to create the accept socket

There are two problems with calling sock_create_kern() from
rds_tcp_accept_one()
1. it sets up a new_sock->sk that is wasteful, because this ->sk
   is going to get replaced by inet_accept() in the subsequent ->accept()
2. The new_sock->sk is a leaked reference in sock_graft() which
   expects to find a null parent->sk

Avoid these problems by calling sock_create_lite().

Orabug: 26477756

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>

diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c
index 4864960db55ac71c3f2420125cc59e6cc48f9ff6..00e6a461219cfd3b7504c617594e45a1bd032588 100644 (file)
--- a/net/rds/tcp_listen.c
+++ b/net/rds/tcp_listen.c
@@ -127,7 +127,7 @@ int rds_tcp_accept_one(struct socket *sock)
        if (!sock) /* module unload or netns delete in progress */
                return -ENETUNREACH;
 
-       ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family,
+       ret = sock_create_lite(sock->sk->sk_family,
                               sock->sk->sk_type, sock->sk->sk_protocol,
                               &new_sock);
        if (ret)