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[2620:137:e000::1:20]) by mx.google.com with ESMTP id m2-20020a655302000000b005073a898556si2434800pgq.385.2023.03.11.09.17.55; Sat, 11 Mar 2023 09:18:10 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@163.com header.s=s110527 header.b=MgFxzSOp; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=163.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229830AbjCKRJg (ORCPT + 99 others); Sat, 11 Mar 2023 12:09:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229469AbjCKRJe (ORCPT ); Sat, 11 Mar 2023 12:09:34 -0500 Received: from m12.mail.163.com (m12.mail.163.com [220.181.12.214]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6E356EC5D; Sat, 11 Mar 2023 09:09:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=39auS PKZnuBFBnPRBUd+UqjHniwggSni0+AncM3Q90Q=; b=MgFxzSOphnh2TvTOZcyXM /0HLGVK9wyERR9QjaAT6qbabX1S47rSnXpoubTvXMmmPy5PhhNWpBvIVwrxKxy8T P+J4sO7HqQRSUFEoKulAk5Lwim1iFpKLS6jj9sq1dp6M+yeTyjbqGeQZj6HsDyl7 VI7gsS6Ks4jt3xoN5WZ8pU= Received: from leanderwang-LC2.localdomain (unknown [111.206.145.21]) by zwqz-smtp-mta-g0-0 (Coremail) with SMTP id _____wAnnhaVtQxkNp8CDA--.24226S2; Sun, 12 Mar 2023 01:08:37 +0800 (CST) From: Zheng Wang To: davem@davemloft.net Cc: simon.horman@corigine.com, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, petrm@nvidia.com, thomas.lendacky@amd.com, wsa+renesas@sang-engineering.com, leon@kernel.org, shayagr@amazon.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, hackerzheng666@gmail.com, 1395428693sheep@gmail.com, alex000young@gmail.com, Zheng Wang Subject: [PATCH v2] xirc2ps_cs: Fix use after free bug in xirc2ps_detach Date: Sun, 12 Mar 2023 01:08:36 +0800 Message-Id: <20230311170836.3919005-1-zyytlz.wz@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: _____wAnnhaVtQxkNp8CDA--.24226S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7WrWxuF4xKrW5Aw4UCr48WFg_yoW8GFyUpr WDJay5Zr4kXwsIvw4xJrWUJF15Was3Kayjgr93C3yFgrn8ArWqgr1rKayjgFyxArWkZF13 Arn09ryxWF1DAFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0ziYLv_UUUUU= X-Originating-IP: [111.206.145.21] X-CM-SenderInfo: h2113zf2oz6qqrwthudrp/xtbBzhkvU2I0XmjvDwAAsr X-Spam-Status: No, score=-0.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_VALIDITY_RPBL,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1760092582068795773?= X-GMAIL-MSGID: =?utf-8?q?1760092582068795773?= In xirc2ps_probe, the local->tx_timeout_task was bounded with xirc2ps_tx_timeout_task. When timeout occurs, it will call xirc_tx_timeout->schedule_work to start the work. When we call xirc2ps_detach to remove the driver, there may be a sequence as follows: Stop responding to timeout tasks and complete scheduled tasks before cleanup in xirc2ps_detach, which will fix the problem. CPU0 CPU1 |xirc2ps_tx_timeout_task xirc2ps_detach | free_netdev | kfree(dev); | | | do_reset | //use dev Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Zheng Wang --- v2: - fix indentation error suggested by Simon Horman, and stop the timeout tasks suggested by Yunsheng Lin --- drivers/net/ethernet/xircom/xirc2ps_cs.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/xircom/xirc2ps_cs.c b/drivers/net/ethernet/xircom/xirc2ps_cs.c index 894e92ef415b..c77ca11d9497 100644 --- a/drivers/net/ethernet/xircom/xirc2ps_cs.c +++ b/drivers/net/ethernet/xircom/xirc2ps_cs.c @@ -503,6 +503,11 @@ static void xirc2ps_detach(struct pcmcia_device *link) { struct net_device *dev = link->priv; + struct local_info *local = netdev_priv(dev); + + netif_carrier_off(dev); + netif_tx_disable(dev); + cancel_work_sync(&local->tx_timeout_task); dev_dbg(&link->dev, "detach\n");