Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race condition

In btsdio_probe, the data->work is bound with btsdio_work. It will be
started in btsdio_send_frame.

If the btsdio_remove runs with a unfinished work, there may be a race
condition that hdev is freed but used in btsdio_work. Fix it by
canceling the work before do cleanup in btsdio_remove.

Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/drivers/bluetooth/btsdio.c b/drivers/bluetooth/btsdio.c
index 0289360..5100032 100644 (file)
--- a/drivers/bluetooth/btsdio.c
+++ b/drivers/bluetooth/btsdio.c
@@ -358,6 +358,7 @@ static void btsdio_remove(struct sdio_func *func)
        if (!data)
                return;
 
+       cancel_work_sync(&data->work);
        hdev = data->hdev;
 
        sdio_set_drvdata(func, NULL);