From 05e9a2f67849e427f8900bad0a3f2a939e8dd3d6 Mon Sep 17 00:00:00 2001 From: Ilia Kolomisnky Date: Fri, 15 Jul 2011 18:30:21 +0000 Subject: [PATCH] Bluetooth: Fix crash with incoming L2CAP connections Another regression fix considering incomming l2cap connections with defer_setup enabled. In situations when incomming connection is extracted with l2cap_sock_accept, it's bt_sock info will have 'parent' member zerroed, but 'parent' may be used unconditionally in l2cap_conn_start() and l2cap_security_cfm() when defer_setup is enabled. Backtrace: [] (l2cap_security_cfm+0x0/0x2ac [bluetooth]) from [] (hci_event_pac ket+0xc2c/0x4aa4 [bluetooth]) [] (hci_event_packet+0x0/0x4aa4 [bluetooth]) from [] (hci_rx_task+0x cc/0x27c [bluetooth]) [] (hci_rx_task+0x0/0x27c [bluetooth]) from [] (tasklet_action+0xa0/ 0x15c) [] (tasklet_action+0x0/0x15c) from [] (__do_softirq+0x98/0x130) r7:00000101 r6:00000018 r5:00000001 r4:efc46000 [] (__do_softirq+0x0/0x130) from [] (do_softirq+0x4c/0x58) [] (do_softirq+0x0/0x58) from [] (run_ksoftirqd+0xb0/0x1b4) r4:efc46000 r3:00000001 [] (run_ksoftirqd+0x0/0x1b4) from [] (kthread+0x84/0x8c) r7:00000000 r6:c008f530 r5:efc47fc4 r4:efc41f08 [] (kthread+0x0/0x8c) from [] (do_exit+0x0/0x5f0) Signed-off-by: Ilia Kolomisnky Signed-off-by: Gustavo F. Padovan Signed-off-by: David S. Miller --- net/bluetooth/l2cap_core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 4fbf67eda239..7705e26e699f 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -620,7 +620,8 @@ static void l2cap_conn_start(struct l2cap_conn *conn) struct sock *parent = bt_sk(sk)->parent; rsp.result = cpu_to_le16(L2CAP_CR_PEND); rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); - parent->sk_data_ready(parent, 0); + if (parent) + parent->sk_data_ready(parent, 0); } else { sk->sk_state = BT_CONFIG; @@ -4009,7 +4010,8 @@ static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) struct sock *parent = bt_sk(sk)->parent; res = L2CAP_CR_PEND; stat = L2CAP_CS_AUTHOR_PEND; - parent->sk_data_ready(parent, 0); + if (parent) + parent->sk_data_ready(parent, 0); } else { sk->sk_state = BT_CONFIG; res = L2CAP_CR_SUCCESS;