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 8972DC761A6 for ; Mon, 3 Apr 2023 14:15:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232917AbjDCOPL (ORCPT ); Mon, 3 Apr 2023 10:15:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232909AbjDCOPJ (ORCPT ); Mon, 3 Apr 2023 10:15:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A53292953E for ; Mon, 3 Apr 2023 07:15:07 -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 ams.source.kernel.org (Postfix) with ESMTPS id 40204B81B35 for ; Mon, 3 Apr 2023 14:15:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C870C433EF; Mon, 3 Apr 2023 14:15:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531305; bh=ApVjCvisLECc8T7GZaG4NPq9k5E8KDEEC9ZqL3Xay98=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MafvIcnFHGOY9xW83Y5vlgh0Nk8CE3uK3WeVsVvxnqolIwAqxKhGVEMeqRw7LpTDg LwrD/42vqmK8EOYUuCLo+SoSwiq/3m25WYylad6gVDl8sjoESYSxTjU0QR8Wf0zovt BlYHmWJeVSJeNmDPwOGVGcHlIGWat0Aj3Mo0smPw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zheng Wang , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 13/84] net: qcom/emac: Fix use after free bug in emac_remove due to race condition Date: Mon, 3 Apr 2023 16:08:14 +0200 Message-Id: <20230403140353.835274761@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140353.406927418@linuxfoundation.org> References: <20230403140353.406927418@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 6b6bc5b8bd2d4ca9e1efa9ae0f98a0b0687ace75 ] In emac_probe, &adpt->work_thread is bound with emac_work_thread. Then it will be started by timeout handler emac_tx_timeout or a IRQ handler emac_isr. If we remove the driver which will call emac_remove to make cleanup, there may be a unfinished work. The possible sequence is as follows: Fix it by finishing the work before cleanup in the emac_remove and disable timeout response. CPU0 CPU1 |emac_work_thread emac_remove | free_netdev | kfree(netdev); | |emac_reinit_locked |emac_mac_down |//use netdev Fixes: b9b17debc69d ("net: emac: emac gigabit ethernet controller driver") Signed-off-by: Zheng Wang Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/qualcomm/emac/emac.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c index 76a9b37c8680f..3c764c28d5dbc 100644 --- a/drivers/net/ethernet/qualcomm/emac/emac.c +++ b/drivers/net/ethernet/qualcomm/emac/emac.c @@ -752,9 +752,15 @@ static int emac_remove(struct platform_device *pdev) struct net_device *netdev = dev_get_drvdata(&pdev->dev); struct emac_adapter *adpt = netdev_priv(netdev); + netif_carrier_off(netdev); + netif_tx_disable(netdev); + unregister_netdev(netdev); netif_napi_del(&adpt->rx_q.napi); + free_irq(adpt->irq.irq, &adpt->irq); + cancel_work_sync(&adpt->work_thread); + emac_clks_teardown(adpt); put_device(&adpt->phydev->mdio.dev); -- 2.39.2