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

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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>
This commit is contained in:
Zheng Wang 2023-03-09 00:45:01 +08:00 committed by Luiz Augusto von Dentz
parent c95930abd6
commit 73f7b171b7
1 changed files with 1 additions and 0 deletions
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drivers/bluetooth/btsdio.c
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@ -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);