From: Steven Rostedt rostedt@goodmis.org
commit 72ef98445aca568a81c2da050532500a8345ad3a upstream.
While looking at a crash report on a timer list being corrupted, which usually happens when a timer is freed while still active. This is commonly triggered by code calling del_timer() instead of del_timer_sync() just before freeing.
One possible culprit is the hci_qca driver, which does exactly that.
Eric mentioned that wake_retrans_timer could be rearmed via the work queue, so also move the destruction of the work queue before del_timer_sync().
Cc: Eric Dumazet eric.dumazet@gmail.com Cc: stable@vger.kernel.org Fixes: 0ff252c1976da ("Bluetooth: hciuart: Add support QCA chipset for UART") Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/bluetooth/hci_qca.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -689,9 +689,9 @@ static int qca_close(struct hci_uart *hu skb_queue_purge(&qca->tx_wait_q); skb_queue_purge(&qca->txq); skb_queue_purge(&qca->rx_memdump_q); - del_timer(&qca->tx_idle_timer); - del_timer(&qca->wake_retrans_timer); destroy_workqueue(qca->workqueue); + del_timer_sync(&qca->tx_idle_timer); + del_timer_sync(&qca->wake_retrans_timer); qca->hu = NULL;
kfree_skb(qca->rx_skb);