lkml.org 
[lkml]   [2022]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.18 37/67] Bluetooth: hci_qca: Use del_timer_sync() before freeing
Date
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
@@ -696,9 +696,9 @@ 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);

\
 
 \ /
  Last update: 2022-06-03 20:22    [W:0.346 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site