Bluetooth: Fix crash when monitor timeout expires

The code was crashing due to a invalid access to hci_conn after the
channel disconnect.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4c7b2d22faa5..2f9bbad42887 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1568,6 +1568,9 @@ static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *m
 
         BT_DBG("sk %p len %d", sk, (int)len);
 
+        if (!conn)
+                return ERR_PTR(-ENOTCONN);
+
         if (sdulen)
                 hlen += 2;