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 5DD3AC46467 for ; Mon, 16 Jan 2023 16:36:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233363AbjAPQgm (ORCPT ); Mon, 16 Jan 2023 11:36:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233357AbjAPQgW (ORCPT ); Mon, 16 Jan 2023 11:36:22 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 94FDB31E38 for ; Mon, 16 Jan 2023 08:25:03 -0800 (PST) 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 4E760B81077 for ; Mon, 16 Jan 2023 16:25:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC099C433D2; Mon, 16 Jan 2023 16:25:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673886301; bh=UM+IYEQ+Mjb3PLieg5k5RFgn+VtJTGcvD3sCgYIhO1E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xvu11ZwUGeN9p7WPaco5vaD7uVweJXHrNUqkYo2HfRVKaUt5xl9DnO9yU5J2IROZI MCpSZM9uLoTKox6nve1RJTLTawDPcSXlqa+VhjGLBhLSfoe8tFp6wdaPrAjolKueqW u4nh0Rid/5MixumGhz0ncoMowjJujkWfNbxnndmk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Li Zetao , Leon Romanovsky , Paolo Abeni , Sasha Levin Subject: [PATCH 5.4 377/658] r6040: Fix kmemleak in probe and remove Date: Mon, 16 Jan 2023 16:47:45 +0100 Message-Id: <20230116154926.808426012@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154909.645460653@linuxfoundation.org> References: <20230116154909.645460653@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: Li Zetao [ Upstream commit 7e43039a49c2da45edc1d9d7c9ede4003ab45a5f ] There is a memory leaks reported by kmemleak: unreferenced object 0xffff888116111000 (size 2048): comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s) hex dump (first 32 bytes): 00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................ 08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [] kmalloc_trace+0x22/0x60 [] phy_device_create+0x4e/0x90 [] get_phy_device+0xd2/0x220 [] mdiobus_scan+0xa4/0x2e0 [] __mdiobus_register+0x482/0x8b0 [] r6040_init_one+0x714/0xd2c [r6040] ... The problem occurs in probe process as follows: r6040_init_one: mdiobus_register mdiobus_scan <- alloc and register phy_device, the reference count of phy_device is 3 r6040_mii_probe phy_connect <- connect to the first phy_device, so the reference count of the first phy_device is 4, others are 3 register_netdev <- fault inject succeeded, goto error handling path // error handling path err_out_mdio_unregister: mdiobus_unregister(lp->mii_bus); err_out_mdio: mdiobus_free(lp->mii_bus); <- the reference count of the first phy_device is 1, it is not released and other phy_devices are released // similarly, the remove process also has the same problem The root cause is traced to the phy_device is not disconnected when removes one r6040 device in r6040_remove_one() or on error handling path after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet device is connected to the first PHY device of mii_bus, in order to notify the connected driver when the link status changes, which is the default behavior of the PHY infrastructure to handle everything. Therefore the phy_device should be disconnected when removes one r6040 device or on error handling path. Fix it by adding phy_disconnect() when removes one r6040 device or on error handling path after r6040_mii probed successfully. Fixes: 3831861b4ad8 ("r6040: implement phylib") Signed-off-by: Li Zetao Reviewed-by: Leon Romanovsky Link: https://lore.kernel.org/r/20221213125614.927754-1-lizetao1@huawei.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ethernet/rdc/r6040.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/rdc/r6040.c b/drivers/net/ethernet/rdc/r6040.c index f158fdf3aab2..b66689e0e6f2 100644 --- a/drivers/net/ethernet/rdc/r6040.c +++ b/drivers/net/ethernet/rdc/r6040.c @@ -1162,10 +1162,12 @@ static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) err = register_netdev(dev); if (err) { dev_err(&pdev->dev, "Failed to register net device\n"); - goto err_out_mdio_unregister; + goto err_out_phy_disconnect; } return 0; +err_out_phy_disconnect: + phy_disconnect(dev->phydev); err_out_mdio_unregister: mdiobus_unregister(lp->mii_bus); err_out_mdio: @@ -1189,6 +1191,7 @@ static void r6040_remove_one(struct pci_dev *pdev) struct r6040_private *lp = netdev_priv(dev); unregister_netdev(dev); + phy_disconnect(dev->phydev); mdiobus_unregister(lp->mii_bus); mdiobus_free(lp->mii_bus); netif_napi_del(&lp->napi); -- 2.35.1