From patchwork Thu Dec 1 13:53:31 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amitkumar Karwar X-Patchwork-Id: 9456173 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3DDB260235 for ; Thu, 1 Dec 2016 13:54:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3190728394 for ; Thu, 1 Dec 2016 13:54:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 25875284D3; Thu, 1 Dec 2016 13:54:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 994D928394 for ; Thu, 1 Dec 2016 13:54:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757351AbcLANyB (ORCPT ); Thu, 1 Dec 2016 08:54:01 -0500 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:43153 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755290AbcLANyA (ORCPT ); Thu, 1 Dec 2016 08:54:00 -0500 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uB1DngjP013350; Thu, 1 Dec 2016 05:53:59 -0800 Received: from sc-exch04.marvell.com ([199.233.58.184]) by mx0a-0016f401.pphosted.com with ESMTP id 26y8mt1e9s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Thu, 01 Dec 2016 05:53:58 -0800 Received: from SC-EXCH04.marvell.com (10.93.176.84) by SC-EXCH04.marvell.com (10.93.176.84) with Microsoft SMTP Server (TLS) id 15.0.1104.5; Thu, 1 Dec 2016 05:53:57 -0800 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH04.marvell.com (10.93.176.84) with Microsoft SMTP Server id 15.0.1104.5 via Frontend Transport; Thu, 1 Dec 2016 05:53:57 -0800 Received: from pe-lt949 (unknown [10.31.130.253]) by maili.marvell.com (Postfix) with ESMTP id 8B63A3F703F; Thu, 1 Dec 2016 05:53:57 -0800 (PST) Received: from pe-lt949 (piotr-probook.localdomain [127.0.0.1]) by pe-lt949 (8.14.4/8.14.4/Debian-4.1ubuntu1) with ESMTP id uB1DrgLD003939; Thu, 1 Dec 2016 19:23:43 +0530 Received: (from root@localhost) by pe-lt949 (8.14.4/8.14.4/Submit) id uB1Drf1S003938; Thu, 1 Dec 2016 19:23:41 +0530 From: Amitkumar Karwar To: CC: Cathy Luo , Nishant Sarmukadam , , , , Amitkumar Karwar Subject: [PATCH] mwifiex: sdio: fix use after free issue for save_adapter Date: Thu, 1 Dec 2016 19:23:31 +0530 Message-ID: <1480600411-3905-1-git-send-email-akarwar@marvell.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-12-01_11:, , signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1612010240 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If we have sdio work requests received when sdio card reset is happening, we may end up accessing older save_adapter pointer later which is already freed during card reset. This patch solves the problem by cancelling those pending requests. Signed-off-by: Amitkumar Karwar --- drivers/net/wireless/marvell/mwifiex/sdio.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c index db01794..44eb65a 100644 --- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -2229,6 +2229,12 @@ static void mwifiex_recreate_adapter(struct sdio_mmc_card *card) mmc_hw_reset(func->card->host); sdio_release_host(func); + /* Previous save_adapter won't be valid after this. We will cancel + * pending work requests. + */ + clear_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &iface_work_flags); + clear_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &iface_work_flags); + mwifiex_sdio_probe(func, device_id); }