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Subject[PATCH] drivers/bluetooth/hci_ldisc.c: fix possible NULL dereferences
From
Commit 22ad42033b7d2b3d7928fba9f89d1c7f8a3c9581 did not completely fix all 
the possible NULL dereferences. Besides hci_uart_close(), we also need to
make sure that hdev is valid before calling hci_{unregister,free}_dev().
Signed-off-by: Eugene Teo <eugeneteo@kernel.sg>
---
drivers/bluetooth/hci_ldisc.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 6055b9c..4813f7c 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -308,11 +308,10 @@ static void hci_uart_tty_close(struct tty_struct *tty)
if (hu) {
struct hci_dev *hdev = hu->hdev;

- if (hdev)
+ if (hdev) {
hci_uart_close(hdev);
-
- if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
- hu->proto->close(hu);
+ if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags))
+ hu->proto->close(hu);
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
-
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