From patchwork Sun Dec 26 17:51:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Christophe JAILLET X-Patchwork-Id: 12699502 X-Patchwork-Delegate: kuba@kernel.org 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 3A320C433FE for ; Sun, 26 Dec 2021 17:51:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233862AbhLZRvt (ORCPT ); Sun, 26 Dec 2021 12:51:49 -0500 Received: from smtp10.smtpout.orange.fr ([80.12.242.132]:52582 "EHLO smtp.smtpout.orange.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233721AbhLZRvt (ORCPT ); Sun, 26 Dec 2021 12:51:49 -0500 Received: from pop-os.home ([86.243.171.122]) by smtp.orange.fr with ESMTPA id 1XgPnz7tj3ptZ1XgQnZJF6; Sun, 26 Dec 2021 18:51:47 +0100 X-ME-Helo: pop-os.home X-ME-Auth: YWZlNiIxYWMyZDliZWIzOTcwYTEyYzlhMmU3ZiQ1M2U2MzfzZDfyZTMxZTBkMTYyNDBjNDJlZmQ3ZQ== X-ME-Date: Sun, 26 Dec 2021 18:51:47 +0100 X-ME-IP: 86.243.171.122 From: Christophe JAILLET To: chris.snook@gmail.com, davem@davemloft.net, kuba@kernel.org, andrew@lunn.ch, linux@rempel-privat.de Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET Subject: [PATCH] net: ag71xx: Fix a potential double free in error handling paths Date: Sun, 26 Dec 2021 18:51:44 +0100 Message-Id: X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 'ndev' is a managed resource allocated with devm_alloc_etherdev(), so there is no need to call free_netdev() explicitly or there will be a double free(). Simplify all error handling paths accordingly. Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver") Signed-off-by: Christophe JAILLET --- This is only compile tested. I don't have the needed toolchain and when I modify KConfig to try to compile, I get some errors that look unrelated to this patch: error: passing argument 2 of ‘ag71xx_hw_set_macaddr’ discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers] Changing the prototype of ag71xx_hw_set_macaddr() to: static void ag71xx_hw_set_macaddr(struct ag71xx *ag, const unsigned char *mac) ^^^^^ makes it work for me, but I don't know if it is the right way to fix this build issue. --- drivers/net/ethernet/atheros/ag71xx.c | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c index 270c2935591b..ec167af0e3b2 100644 --- a/drivers/net/ethernet/atheros/ag71xx.c +++ b/drivers/net/ethernet/atheros/ag71xx.c @@ -1862,15 +1862,12 @@ static int ag71xx_probe(struct platform_device *pdev) ag->mac_reset = devm_reset_control_get(&pdev->dev, "mac"); if (IS_ERR(ag->mac_reset)) { netif_err(ag, probe, ndev, "missing mac reset\n"); - err = PTR_ERR(ag->mac_reset); - goto err_free; + return PTR_ERR(ag->mac_reset); } ag->mac_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (!ag->mac_base) { - err = -ENOMEM; - goto err_free; - } + if (!ag->mac_base) + return -ENOMEM; ndev->irq = platform_get_irq(pdev, 0); err = devm_request_irq(&pdev->dev, ndev->irq, ag71xx_interrupt, @@ -1878,7 +1875,7 @@ static int ag71xx_probe(struct platform_device *pdev) if (err) { netif_err(ag, probe, ndev, "unable to request IRQ %d\n", ndev->irq); - goto err_free; + return err; } ndev->netdev_ops = &ag71xx_netdev_ops; @@ -1906,10 +1903,8 @@ static int ag71xx_probe(struct platform_device *pdev) ag->stop_desc = dmam_alloc_coherent(&pdev->dev, sizeof(struct ag71xx_desc), &ag->stop_desc_dma, GFP_KERNEL); - if (!ag->stop_desc) { - err = -ENOMEM; - goto err_free; - } + if (!ag->stop_desc) + return -ENOMEM; ag->stop_desc->data = 0; ag->stop_desc->ctrl = 0; @@ -1924,7 +1919,7 @@ static int ag71xx_probe(struct platform_device *pdev) err = of_get_phy_mode(np, &ag->phy_if_mode); if (err) { netif_err(ag, probe, ndev, "missing phy-mode property in DT\n"); - goto err_free; + return err; } netif_napi_add(ndev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT); @@ -1932,7 +1927,7 @@ static int ag71xx_probe(struct platform_device *pdev) err = clk_prepare_enable(ag->clk_eth); if (err) { netif_err(ag, probe, ndev, "Failed to enable eth clk.\n"); - goto err_free; + return err; } ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, 0); @@ -1968,8 +1963,6 @@ static int ag71xx_probe(struct platform_device *pdev) ag71xx_mdio_remove(ag); err_put_clk: clk_disable_unprepare(ag->clk_eth); -err_free: - free_netdev(ndev); return err; }