This is a note to let you know that I've just added the patch titled
Bluetooth: btsdio: fix use after free bug in btsdio_remove due to unfinished work
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-btsdio-fix-use-after-free-bug-in-btsdio_re.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d58ee6bbc800511f5936c066631b89339e7a979f
Author: Zheng Wang <zyytlz.wz@xxxxxxx>
Date: Thu Mar 9 16:07:39 2023 +0800
Bluetooth: btsdio: fix use after free bug in btsdio_remove due to unfinished work
[ Upstream commit 1e9ac114c4428fdb7ff4635b45d4f46017e8916f ]
In btsdio_probe, &data->work was bound with btsdio_work.In
btsdio_send_frame, it was started by schedule_work.
If we call btsdio_remove with an unfinished job, there may
be a race condition and cause UAF bug on hdev.
Fixes: ddbaf13e3609 ("[Bluetooth] Add generic driver for Bluetooth SDIO devices")
Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/bluetooth/btsdio.c b/drivers/bluetooth/btsdio.c
index 20142bc77554c..bd55bf7a9914c 100644
--- a/drivers/bluetooth/btsdio.c
+++ b/drivers/bluetooth/btsdio.c
@@ -353,6 +353,7 @@ static void btsdio_remove(struct sdio_func *func)
BT_DBG("func %p", func);
+ cancel_work_sync(&data->work);
if (!data)
return;
