From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C449171A9 for ; Mon, 22 May 2023 19:41:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F699C433EF; Mon, 22 May 2023 19:41:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684784512; bh=jKJQM7Amchlo/TIBhIhoRm4akaWOf6RtKsRisaHbqM8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XK0SE681/+vXAYl3QufYSVtza8l93c7Znm6cjajPh0kGHCepy3JtHQMmQx8jSa2OP 119nheHJakvrBEYZ3ShyMrlcDUbQY+3n27beW0UiarLWXarqT2pbU/+muHxrx2ETcE AK2yHHbq4UCNVD5yk9fVKHt0fU0ezHtfmwB569fI= 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 6.3 106/364] scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition Date: Mon, 22 May 2023 20:06:51 +0100 Message-Id: <20230522190415.414343857@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190412.801391872@linuxfoundation.org> References: <20230522190412.801391872@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 142eb5d5d9df6..de2e7bcf47847 100644 --- a/drivers/message/fusion/mptlan.c +++ b/drivers/message/fusion/mptlan.c @@ -1433,7 +1433,9 @@ 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