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DLM: fix NULL pointer dereference in send_to_sock() 

The writequeue and writequeue_lock member of othercon was not initialized.
If lowcomms_state_change() is called from network layer, othercon->swork
may be scheduled. In this case, send_to_sock() will generate a NULL pointer
reference. We avoid this problem by correctly initializing writequeue and
writequeue_lock member of othercon.

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>
This commit is contained in:
tsutomu.owa@toshiba.co.jp 2017-09-12 09:02:10 +00:00 committed by David Teigland
parent 0aa18464c8
commit 26b41099e7
1 changed files with 4 additions and 0 deletions
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4
fs/dlm/lowcomms.c
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@ -802,6 +802,8 @@ static int tcp_accept_from_sock(struct connection *con)
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
INIT_LIST_HEAD(&othercon->writequeue);
spin_lock_init(&othercon->writequeue_lock);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
@ -920,6 +922,8 @@ static int sctp_accept_from_sock(struct connection *con)
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
INIT_LIST_HEAD(&othercon->writequeue);
spin_lock_init(&othercon->writequeue_lock);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);