From nobody Wed Dec 17 10:26:50 2025 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 5AB3AC77B76 for ; Thu, 20 Apr 2023 14:03:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231804AbjDTODA (ORCPT ); Thu, 20 Apr 2023 10:03:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230248AbjDTOC6 (ORCPT ); Thu, 20 Apr 2023 10:02:58 -0400 Received: from zg8tmtyylji0my4xnjqumte4.icoremail.net (zg8tmtyylji0my4xnjqumte4.icoremail.net [162.243.164.118]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 968521FEA for ; Thu, 20 Apr 2023 07:02:55 -0700 (PDT) Received: from ubuntu.localdomain (unknown [218.12.18.95]) by mail-app3 (Coremail) with SMTP id cC_KCgDn7w_XRUFkQSOLAA--.3844S2; Thu, 20 Apr 2023 22:02:12 +0800 (CST) From: Duoming Zhou To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, intel-wired-lan@lists.osuosl.org, Duoming Zhou Subject: [PATCH net] ethernet: ixgb: fix use after free bugs caused by circular dependency problem Date: Thu, 20 Apr 2023 22:01:57 +0800 Message-Id: <20230420140157.22416-1-duoming@zju.edu.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: cC_KCgDn7w_XRUFkQSOLAA--.3844S2 X-Coremail-Antispam: 1UD129KBjvJXoW7Ar17Xr4fWF48CF17Cw1rZwb_yoW8Ar13p3 ySva4fJF10qr4YvFyxXr1kJFyrGas7ArWkKF1xCw4ru3Z7ArnYgr9Ykry0gFyrGFZ8ZF43 AF1F93y5CwnxAwUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkE14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4 xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43 MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I 0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x0JUdHU DUUUUU= X-CM-SenderInfo: qssqjiasttq6lmxovvfxof0/1tbiAwMLAWRAA1s8WwAwsh Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The watchdog_timer can schedule tx_timeout_task and tx_timeout_task can also arm watchdog_timer. The process is shown below: ----------- timer schedules work ------------ ixgb_watchdog() //timer handler schedule_work(&adapter->tx_timeout_task) ----------- work arms timer ------------ ixgb_tx_timeout_task() //workqueue callback function ixgb_up() mod_timer(&adapter->watchdog_timer,...) When ixgb device is detaching, the timer and workqueue could still be rearmed. The process is shown below: (cleanup routine) | (timer and workqueue routine) ixgb_remove() | | ixgb_tx_timeout_task() //workqueue | ixgb_up() | mod_timer() cancel_work_sync() | free_netdev(netdev) //FREE | ixgb_watchdog() //timer | netif_carrier_ok(netdev) //USE This patch adds timer_shutdown_sync() in ixgb_remove(), which could prevent rearming of the timer from the workqueue. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Duoming Zhou --- drivers/net/ethernet/intel/ixgb/ixgb_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethe= rnet/intel/ixgb/ixgb_main.c index b4d47e7a76c..6ce3601904b 100644 --- a/drivers/net/ethernet/intel/ixgb/ixgb_main.c +++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c @@ -516,6 +516,7 @@ ixgb_remove(struct pci_dev *pdev) struct net_device *netdev =3D pci_get_drvdata(pdev); struct ixgb_adapter *adapter =3D netdev_priv(netdev); =20 + timer_shutdown_sync(&adapter->watchdog_timer); cancel_work_sync(&adapter->tx_timeout_task); =20 unregister_netdev(netdev); --=20 2.17.1