[PATCH 5.10 013/406] Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race condition

Greg Kroah-Hartman
2023-09-17T19:17:46Z

From: Zheng Wang <zyytlz.wz@163.com>

commit 73f7b171b7c09139eb3c6a5677c200dc1be5f318 upstream.

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.

Fixes: CVE-2023-1989
Fixes: ddbaf13e3609 ("[Bluetooth] Add generic driver for Bluetooth SDIO devices")
Cc: stable@vger.kernel.org
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
[ Denis: Added CVE-2023-1989 and fixes tags. ]
Signed-off-by: Denis Efremov (Oracle) <efremov@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/bluetooth/btsdio.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/bluetooth/btsdio.c
+++ b/drivers/bluetooth/btsdio.c
@@ -355,6 +355,7 @@ static void btsdio_remove(struct sdio_fu
if (!data)
return;

+ cancel_work_sync(&data->work);
hdev = data->hdev;

sdio_set_drvdata(func, NULL);