[PATCH 1/2] work around for l2cap NULL dereference in l2cap_conn_start print sk

[David Fries]

---
 net/bluetooth/l2cap.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index fda7741..ff05f51 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -400,7 +400,16 @@ 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) {
+						printk(KERN_DEBUG "avoided "
+							"crash in %s sk %p "
+							"result %d status %d\n",
+							__func__, sk,
+							rsp.result, rsp.status);
+					} else {
+						parent->sk_data_ready(parent,
+							0);
+					}
 
 				} else {
 					sk->sk_state = BT_CONFIG;
-- 
1.7.2.3