From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8A3D0C7EE2D for ; Mon, 22 May 2023 19:16:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233998AbjEVTQW (ORCPT ); Mon, 22 May 2023 15:16:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38864 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234183AbjEVTQG (ORCPT ); Mon, 22 May 2023 15:16:06 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE6BCCA for ; Mon, 22 May 2023 12:15:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id AFE266274F for ; Mon, 22 May 2023 19:15:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CEF20C433D2; Mon, 22 May 2023 19:15:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684782951; bh=sxrXFG9zskyTrjrIVOYCIzQ7hBRzHxYT6ADBMRecYQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0G8KTrcnc4waSIcT23j1ocJBT0HXBmBaCUBEwFPy+pEkEZ54bvZTWdHklDGCQdZ6F 7yqUkC15WsXldiJqyeUApMnlyHZ5XZWqfYnoU/8U0AhH8DqWM8ruvs6kXsmExcX4m8 VoFz7BO9nJPwZSACnQ0JDLwaI2WLTtHzTsGh08uw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zheng Wang , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.15 059/203] scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition Date: Mon, 22 May 2023 20:08:03 +0100 Message-Id: <20230522190356.628289619@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190354.935300867@linuxfoundation.org> References: <20230522190354.935300867@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zheng Wang [ Upstream commit f486893288f3e9b171b836f43853a6426515d800 ] mptlan_probe() calls mpt_register_lan_device() which initializes the &priv->post_buckets_task workqueue. A call to mpt_lan_wake_post_buckets_task() will subsequently start the work. During driver unload in mptlan_remove() the following race may occur: CPU0 CPU1 |mpt_lan_post_receive_buckets_work() mptlan_remove() | free_netdev() | kfree(dev); | | | dev->mtu | //use Fix this by finishing the work prior to cleaning up in mptlan_remove(). [mkp: we really should remove mptlan instead of attempting to fix it] Signed-off-by: Zheng Wang Link: https://lore.kernel.org/r/20230318081635.796479-1-zyytlz.wz@163.com Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/message/fusion/mptlan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c index 3261cac762def..ec3ee356078db 100644 --- a/drivers/message/fusion/mptlan.c +++ b/drivers/message/fusion/mptlan.c @@ -1427,7 +1427,9 @@ mptlan_remove(struct pci_dev *pdev) { MPT_ADAPTER *ioc = pci_get_drvdata(pdev); struct net_device *dev = ioc->netdev; + struct mpt_lan_priv *priv = netdev_priv(dev); + cancel_delayed_work_sync(&priv->post_buckets_task); if(dev != NULL) { unregister_netdev(dev); free_netdev(dev); -- 2.39.2