Bluetooth: L2CAP: Fix invalid access on ECRED Connection response

The use of l2cap_chan_del is not safe under a loop using
list_for_each_entry.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap_core.c

@@ -6066,7 +6066,7 @@ static inline int l2cap_ecred_conn_rsp(struct l2cap_conn *conn,
 	struct l2cap_ecred_conn_rsp *rsp = (void *) data;
 	struct hci_conn *hcon = conn->hcon;
 	u16 mtu, mps, credits, result;
-	struct l2cap_chan *chan;
+	struct l2cap_chan *chan, *tmp;
 	int err = 0, sec_level;
 	int i = 0;
 
@@ -6085,7 +6085,7 @@ static inline int l2cap_ecred_conn_rsp(struct l2cap_conn *conn,
 
 	cmd_len -= sizeof(*rsp);
 
-	list_for_each_entry(chan, &conn->chan_l, list) {
+	list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
 		u16 dcid;
 
 		if (chan->ident != cmd->ident ||