From patchwork Tue Jul 28 01:44:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tetsuo Handa X-Patchwork-Id: 11687855 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B6201722 for ; Tue, 28 Jul 2020 01:45:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B7592083E for ; Tue, 28 Jul 2020 01:45:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726753AbgG1BpA (ORCPT ); Mon, 27 Jul 2020 21:45:00 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:52595 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726575AbgG1BpA (ORCPT ); Mon, 27 Jul 2020 21:45:00 -0400 Received: from fsav303.sakura.ne.jp (fsav303.sakura.ne.jp [153.120.85.134]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id 06S1iJxD088794; Tue, 28 Jul 2020 10:44:19 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav303.sakura.ne.jp (F-Secure/fsigk_smtp/550/fsav303.sakura.ne.jp); Tue, 28 Jul 2020 10:44:19 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/fsav303.sakura.ne.jp) Received: from localhost.localdomain (M106072142033.v4.enabler.ne.jp [106.72.142.33]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id 06S1iFhm088645 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 28 Jul 2020 10:44:19 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) From: Tetsuo Handa To: gbhat@marvell.com Cc: amitkarwar@gmail.com, andreyknvl@google.com, davem@davemloft.net, dvyukov@google.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, nishants@marvell.com, syzbot+dc4127f950da51639216@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, Tetsuo Handa , syzbot Subject: [PATCH] mwifiex: don't call del_timer_sync() on uninitialized timer Date: Tue, 28 Jul 2020 10:44:12 +0900 Message-Id: <1595900652-3842-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org 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 Reported-by: syzbot Cc: Ganapathi Bhat Signed-off-by: Tetsuo Handa Reviewed-by: Brian Norris --- 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; }