diff options
| author | tsutomu.owa@toshiba.co.jp <tsutomu.owa@toshiba.co.jp> | 2017-09-12 08:56:00 +0000 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2017-09-25 12:45:21 -0500 |
| commit | c7355827b27c550824bbcc1f0586cf993bf83d94 (patch) | |
| tree | bb0bd450da10d4ea1281dfdad7bfb417fde5cad2 /fs/dlm | |
| parent | b2a6662932c52304eee11323701f8a01aa110e37 (diff) | |
| download | lwn-c7355827b27c550824bbcc1f0586cf993bf83d94.tar.gz lwn-c7355827b27c550824bbcc1f0586cf993bf83d94.zip | |
DLM: fix to use sock_mutex correctly in xxx_accept_from_sock
In the current implementation, we think that exclusion control
for othercon in tcp_accept_from_sock() and sctp_accept_from_sock()
was not enough. We fix them.
Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/lowcomms.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 420946dcb7ca..b275813c9901 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -801,16 +801,19 @@ static int tcp_accept_from_sock(struct connection *con) INIT_WORK(&othercon->rwork, process_recv_sockets); set_bit(CF_IS_OTHERCON, &othercon->flags); } + mutex_lock_nested(&othercon->sock_mutex, 2); if (!othercon->sock) { newcon->othercon = othercon; othercon->sock = newsock; newsock->sk->sk_user_data = othercon; add_sock(newsock, othercon); addcon = othercon; + mutex_unlock(&othercon->sock_mutex); } else { printk("Extra connection from node %d attempted\n", nodeid); result = -EAGAIN; + mutex_unlock(&othercon->sock_mutex); mutex_unlock(&newcon->sock_mutex); goto accept_err; } @@ -918,15 +921,18 @@ static int sctp_accept_from_sock(struct connection *con) INIT_WORK(&othercon->rwork, process_recv_sockets); set_bit(CF_IS_OTHERCON, &othercon->flags); } + mutex_lock_nested(&othercon->sock_mutex, 2); if (!othercon->sock) { newcon->othercon = othercon; othercon->sock = newsock; newsock->sk->sk_user_data = othercon; add_sock(newsock, othercon); addcon = othercon; + mutex_unlock(&othercon->sock_mutex); } else { printk("Extra connection from node %d attempted\n", nodeid); ret = -EAGAIN; + mutex_unlock(&othercon->sock_mutex); mutex_unlock(&newcon->sock_mutex); goto accept_err; } |