From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: gbhat@marvell.com, amitkarwar@gmail.com, andreyknvl@google.com,
"David S. Miller" <davem@davemloft.net>,
Dmitry Vyukov <dvyukov@google.com>,
huxinming820@gmail.com, Kalle Valo <kvalo@codeaurora.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
USB <linux-usb@vger.kernel.org>,
"open list:TI WILINK WIRELES..." <linux-wireless@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
Nishant Sarmukadam <nishants@marvell.com>,
syzbot+dc4127f950da51639216@syzkaller.appspotmail.com,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
syzbot <syzbot+373e6719b49912399d21@syzkaller.appspotmail.com>
Subject: Re: [PATCH] mwifiex: don't call del_timer_sync() on uninitialized timer
Date: Tue, 28 Jul 2020 20:29:05 +0300 [thread overview]
Message-ID: <CAHp75Vdta2xGDH=0CwRf8yK30JQimSGj70-pXz7QUFSgjxoatQ@mail.gmail.com> (raw)
In-Reply-To: <1595900652-3842-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp>
On Tue, Jul 28, 2020 at 4:46 AM Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
>
> syzbot is reporting that del_timer_sync() is called from
> mwifiex_usb_cleanup_tx_aggr() from mwifiex_unregister_dev() without
> checking timer_setup() from mwifiex_usb_tx_init() was called [1].
> Since mwifiex_usb_prepare_tx_aggr_skb() is calling del_timer() if
> is_hold_timer_set == true, use the same condition for del_timer_sync().
>
> [1] https://syzkaller.appspot.com/bug?id=fdeef9cf7348be8b8ab5b847f2ed993aba8ea7b6
>
Can you use BugLink: tag for above?
> Reported-by: syzbot <syzbot+373e6719b49912399d21@syzkaller.appspotmail.com>
> Cc: Ganapathi Bhat <gbhat@marvell.com>
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> ---
> A patch from Ganapathi Bhat ( https://patchwork.kernel.org/patch/10990275/ ) is stalling
> at https://lore.kernel.org/linux-usb/MN2PR18MB2637D7C742BC235FE38367F0A09C0@MN2PR18MB2637.namprd18.prod.outlook.com/ .
> syzbot by now got this report for 10000 times. Do we want to go with this simple patch?
>
> drivers/net/wireless/marvell/mwifiex/usb.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c
> index 6f3cfde..04a1461 100644
> --- a/drivers/net/wireless/marvell/mwifiex/usb.c
> +++ b/drivers/net/wireless/marvell/mwifiex/usb.c
> @@ -1353,7 +1353,8 @@ static void mwifiex_usb_cleanup_tx_aggr(struct mwifiex_adapter *adapter)
> skb_dequeue(&port->tx_aggr.aggr_list)))
> mwifiex_write_data_complete(adapter, skb_tmp,
> 0, -1);
> - del_timer_sync(&port->tx_aggr.timer_cnxt.hold_timer);
> + if (port->tx_aggr.timer_cnxt.is_hold_timer_set)
> + del_timer_sync(&port->tx_aggr.timer_cnxt.hold_timer);
> port->tx_aggr.timer_cnxt.is_hold_timer_set = false;
> port->tx_aggr.timer_cnxt.hold_tmo_msecs = 0;
> }
> --
> 1.8.3.1
>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-07-28 17:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 14:26 INFO: trying to register non-static key in del_timer_sync (2) syzbot
2019-06-01 17:52 ` [EXT] " Ganapathi Bhat
2019-06-03 5:20 ` Dmitry Vyukov
2019-06-03 8:41 ` Ganapathi Bhat
2019-06-12 16:01 ` Ganapathi Bhat
2019-06-12 16:13 ` Andrey Konovalov
2019-06-12 16:59 ` syzbot
2019-08-13 13:36 ` [EXT] " Andrey Konovalov
2019-08-13 13:58 ` Kalle Valo
2019-08-14 14:08 ` Ganapathi Bhat
2019-10-01 16:40 ` Andrey Konovalov
2019-10-02 14:28 ` Ganapathi Bhat
2020-07-28 1:44 ` [PATCH] mwifiex: don't call del_timer_sync() on uninitialized timer Tetsuo Handa
2020-07-28 17:29 ` Andy Shevchenko [this message]
2020-07-28 18:45 ` Brian Norris
2020-08-17 13:06 ` Tetsuo Handa
2020-08-21 8:27 ` [PATCH v2] " Tetsuo Handa
2020-08-24 18:52 ` Brian Norris
2020-08-27 4:50 ` [EXT] " Ganapathi Bhat
2020-08-27 10:00 ` Kalle Valo
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