[DLM] Telnet to port 21064 can stop all lockspaces
This patch fixes Red Hat bz#245892
Opening a tcp connection from a cluster member to another cluster member
targeting the dlm port it is enough to stop every dlm operation in the cluster.
This means that GFS and rgmanager will hang.
Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index fc0bff7..73d44f5 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -720,11 +720,17 @@
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
newcon->othercon = othercon;
+ othercon->sock = newsock;
+ newsock->sk->sk_user_data = othercon;
+ add_sock(newsock, othercon);
+ addcon = othercon;
}
- othercon->sock = newsock;
- newsock->sk->sk_user_data = othercon;
- add_sock(newsock, othercon);
- addcon = othercon;
+ else {
+ printk("Extra connection from node %d attempted\n", nodeid);
+ result = -EAGAIN;
+ up_write(&newcon->sock_sem);
+ goto accept_err;
+ }
}
else {
newsock->sk->sk_user_data = newcon;