[Cluster-devel] [PATCH 14/17] dlm: fix memory leak in tcp_accept_from_sock()

[tsutomu.owa]

The sk member of the socket generated by sock_create_kern() is overwritten
by ops->accept(). So the previous sk will not be released.
We use kernel_accept() instead of sock_create_kern() and ops->accept().

Signed-off-by: Tadashi Miyauchi <miyau...@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu....@toshiba.co.jp>
---
 fs/dlm/lowcomms.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 74ed41e..3e7c096 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -732,22 +732,14 @@ static int tcp_accept_from_sock(struct connection *con)
        }
        mutex_unlock(&connections_lock);
 
-       memset(&peeraddr, 0, sizeof(peeraddr));
-       result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
-                                 SOCK_STREAM, IPPROTO_TCP, &newsock);
-       if (result < 0)
-               return -ENOMEM;
-
        mutex_lock_nested(&con->sock_mutex, 0);
 
-       result = -ENOTCONN;
-       if (con->sock == NULL)
-               goto accept_err;
-
-       newsock->type = con->sock->type;
-       newsock->ops = con->sock->ops;
+       if (!con->sock) {
+               mutex_unlock(&con->sock_mutex);
+               return -ENOTCONN;
+       }
 
-       result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK);
+       result = kernel_accept(con->sock, &newsock, O_NONBLOCK);
        if (result < 0)
                goto accept_err;
 
@@ -844,7 +836,8 @@ static int tcp_accept_from_sock(struct connection *con)
 
 accept_err:
        mutex_unlock(&con->sock_mutex);
-       sock_release(newsock);
+       if (newsock)
+               sock_release(newsock);
 
        if (result != -EAGAIN)
                log_print("error accepting connection from node: %d", result);
-- 
2.7.4