From patchwork Wed Oct 4 09:12:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 13408501 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 B61E5107A8 for ; Wed, 4 Oct 2023 09:13:08 +0000 (UTC) Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D610CA7; Wed, 4 Oct 2023 02:13:06 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.03,199,1694703600"; d="scan'208";a="178147041" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 04 Oct 2023 18:13:06 +0900 Received: from localhost.localdomain (unknown [10.166.15.32]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id ECDEB41BB248; Wed, 4 Oct 2023 18:13:05 +0900 (JST) From: Yoshihiro Shimoda To: s.shtylyov@omp.ru, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda , Zheng Wang Subject: [PATCH net 2/2] ravb: Fix use-after-free issue in ravb_remove and ravb_tx_timeout_work Date: Wed, 4 Oct 2023 18:12:53 +0900 Message-Id: <20231004091253.4194205-3-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231004091253.4194205-1-yoshihiro.shimoda.uh@renesas.com> References: <20231004091253.4194205-1-yoshihiro.shimoda.uh@renesas.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org The ravb_stop() should call cancel_work_sync(). Otherwise, ravb_tx_timeout_work() is possible to use the freed priv after ravb_remove() was called like below: CPU0 CPU1 ravb_tx_timeout() ravb_remove() unregister_netdev() free_netdev(ndev) // free priv ravb_tx_timeout_work() // use priv unregister_netdev() will call .ndo_stop() so that ravb_stop() is called. And, after phy_stop() was called, netif_carrier_off() is also called. So that .ndo_tx_timeout() will be not called after phy_stop(). Link: https://lore.kernel.org/netdev/872cf8d7-3bd6-b11a-82ac-a9f4c82d0a02@omp.ru/ Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Reported-by: Zheng Wang Signed-off-by: Yoshihiro Shimoda Reviewed-by: Sergey Shtylyov --- drivers/net/ethernet/renesas/ravb_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 9e2e801049cc..0ef0b88b7145 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2167,6 +2167,8 @@ static int ravb_close(struct net_device *ndev) of_phy_deregister_fixed_link(np); } + cancel_work_sync(&priv->work); + if (info->multi_irqs) { free_irq(priv->tx_irqs[RAVB_NC], ndev); free_irq(priv->rx_irqs[RAVB_NC], ndev);