Bluetooth: hci_ldisc: Fix null pointer derefence in case of early data

HCI_UART_PROTO_SET flag is set before hci_uart_set_proto call. If we
receive data from tty layer during this procedure, proto pointer may
not be assigned yet, leading to null pointer dereference in rx method
hci_uart_tty_receive.

This patch fixes this issue by introducing HCI_UART_PROTO_READY flag in
order to avoid any proto operation before proto opening and assignment.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 8 insertions, 4 deletions

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index c00168a5bb80..49b3e1e2d236 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -227,7 +227,7 @@ static int hci_uart_flush(struct hci_dev *hdev)
         tty_ldisc_flush(tty);
         tty_driver_flush_buffer(tty);
 
-        if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+        if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
                 hu->proto->flush(hu);
 
         return 0;
@@ -492,7 +492,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
 
         cancel_work_sync(&hu->write_work);
 
-        if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
+        if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
                 if (hdev) {
                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
                                 hci_unregister_dev(hdev);
@@ -500,6 +500,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
                 }
                 hu->proto->close(hu);
         }
+        clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 
         kfree(hu);
 }
@@ -526,7 +527,7 @@ static void hci_uart_tty_wakeup(struct tty_struct *tty)
         if (tty != hu->tty)
                 return;
 
-        if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+        if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
                 hci_uart_tx_wakeup(hu);
 }
 
@@ -550,7 +551,7 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
         if (!hu || tty != hu->tty)
                 return;
 
-        if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
+        if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
                 return;
 
         /* It does not need a lock here as it is already protected by a mutex in
@@ -638,9 +639,11 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
                 return err;
 
         hu->proto = p;
+        set_bit(HCI_UART_PROTO_READY, &hu->flags);
 
         err = hci_uart_register_dev(hu);
         if (err) {
+                clear_bit(HCI_UART_PROTO_READY, &hu->flags);
                 p->close(hu);
                 return err;
         }
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 4814ff08f427..839bad1d8152 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -95,6 +95,7 @@ struct hci_uart {
 /* HCI_UART proto flag bits */
 #define HCI_UART_PROTO_SET      0
 #define HCI_UART_REGISTERED     1
+#define HCI_UART_PROTO_READY    2
 
 /* TX states  */
 #define HCI_UART_SENDING        1