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([82.78.167.125]) by smtp.gmail.com with ESMTPSA id mb22-20020a170906eb1600b009fc0c42098csm4603423ejb.173.2023.11.26.06.10.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Nov 2023 06:10:51 -0800 (PST) From: Claudiu Beznea To: nicolas.ferre@microchip.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk, jgarzik@pobox.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea Subject: [PATCH 1/2] net: phy: Check phydev->drv before dereferencing it Date: Sun, 26 Nov 2023 16:10:45 +0200 Message-Id: <20231126141046.3505343-2-claudiu.beznea@tuxon.dev> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> References: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> MIME-Version: 1.0 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sun, 26 Nov 2023 06:15:02 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783642453664096314 X-GMAIL-MSGID: 1783700456466661550 The macb driver calls mdiobus_unregister() and mdiobus_free() in its remove function before calling unregister_netdev(). unregister_netdev() calls the driver-specific struct net_device_ops::ndo_stop function (macb_close()), and macb_close() calls phylink_disconnect_phy(). This, in turn, will call: phy_disconnect() -> phy_free_interrupt() -> phy_disable_interrupts() -> phy_config_interrupt() which dereference phydev->drv, which was already freed by: mdiobus_unregister() -> phy_mdio_device_remove() -> device_del() -> bus_remove_device() -> device_release_driver_internal() -> phy_remove() from macb_close(). Although the sequence in the macb driver is not correct, check phydev->drv       before dereferencing it in phy_config_interrupt() to avoid scenarios like the one described. Fixes: 00db8189d984 ("This patch adds a PHY Abstraction Layer to the Linux Kernel") Signed-off-by: Claudiu Beznea --- drivers/net/phy/phy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index a5fa077650e8..dd98a4b3ef81 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -165,7 +165,7 @@ EXPORT_SYMBOL_GPL(phy_get_rate_matching); static int phy_config_interrupt(struct phy_device *phydev, bool interrupts) { phydev->interrupts = interrupts ? 1 : 0; - if (phydev->drv->config_intr) + if (phydev->drv && phydev->drv->config_intr) return phydev->drv->config_intr(phydev); return 0; From patchwork Sun Nov 26 14:10:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: claudiu beznea X-Patchwork-Id: 169992 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:ce62:0:b0:403:3b70:6f57 with SMTP id o2csp2881624vqx; Sun, 26 Nov 2023 22:16:11 -0800 (PST) X-Google-Smtp-Source: AGHT+IEmAxw2OLg9l4QpnIW1drKLFu1/qjXcFvF+uNcQEwP0Ftgy6ToqedkY/2PjOBYqEl+olWlQ X-Received: by 2002:a05:6830:20cb:b0:6c6:18c7:7ca2 with SMTP id z11-20020a05683020cb00b006c618c77ca2mr12717400otq.12.1701065771322; Sun, 26 Nov 2023 22:16:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1701065771; cv=none; d=google.com; s=arc-20160816; b=jzaES+mBOBI1174gdESErziD+3wYL8FzpB68zF3ZUY1tTb3YFi9k8xQKUO1TaUWgzZ SwItnNEfqWUz8bHMxYC+70uXe32jJt60fiuzVk43nvopbX3gETixHStFc/feqfs5VxFH YVqFnGQTPCugihMxcVO4K6momS2MeOCZk4C2dY/T/auij5Aorng/iZ5E1k+MurKXuM9B RBTPyrxKKnU1jLmeGR6YRMxibcIdzHWTPWZse7vLcgbg9X/s8TXWNbcGLtmmOtdhqo42 OGIVgupGQWn1TE5tceyxr/m3U0vQHDtsVDjZTE4ZyWFcsYdGGmUibW6cM49F7cyhZq8r v29g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=G30K0Y0szZ7FUxHtENoJCMPPG9CnH+Xt3mCwLqz9nTs=; fh=LFcv2OHzfpz/VcIjGaAV3U9+3Y1V0RaOGvgbSTwNd8g=; b=y4KNtEi/LFE8x7RapK5/zv5BgZGJG5V3qdRg+IxFNzbhwwSoR3/wm23E6xrqXzMgEe xeiKOw15skWW6Vt+eQIIzTKBfXXoyYtelTDqhcUYZTDGp/QkWAkeiPdwKa701k2+w9+8 CBVAmjA6qgIxVjMNgDxW0ShkAuhRPA0118/GsDJAkFXVvxnOJnR7p8X86cazUrHPchBT j+b/0QDmmLoVPXIw8N6Ba4cCE31iN4K8lrKnJDduPSKR/NZfFl/dkwhOWn86rvHY/EH4 XMQuWJ7oSrDqL4uInbbDE7ko0tOwVhODW3JGin4V7DgWuT1Bx3yo6Y8qhqIYa0nKi/Sg 8Lew== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@tuxon.dev header.s=google header.b=R0MX3P5L; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from pete.vger.email (pete.vger.email. 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([82.78.167.125]) by smtp.gmail.com with ESMTPSA id mb22-20020a170906eb1600b009fc0c42098csm4603423ejb.173.2023.11.26.06.10.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Nov 2023 06:10:52 -0800 (PST) From: Claudiu Beznea To: nicolas.ferre@microchip.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk, jgarzik@pobox.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea Subject: [PATCH 2/2] net: macb: Unregister nedev before MDIO bus in remove Date: Sun, 26 Nov 2023 16:10:46 +0200 Message-Id: <20231126141046.3505343-3-claudiu.beznea@tuxon.dev> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> References: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> MIME-Version: 1.0 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sun, 26 Nov 2023 06:15:17 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783642392434701376 X-GMAIL-MSGID: 1783696741967796352 unregister_netdev() calls the struct net_device_ops::ndo_stop function, which in the case of the macb driver is macb_close(). macb_close() calls, in turn, PHY-specific APIs (e.g., phy_detach()). The call trace is as follows: macb_close() -> phylink_disconnect_phy() -> phy_disconnect() -> phy_detach() phy_detach() will remove associated sysfs files by calling kernfs_remove_by_name_ns(), which will hit "kernfs: cannot remove 'attached_dev', no directory" WARN(), which will throw a stack trace too. To avoid this, call unregiser_netdev() before mdiobus_unregister() and mdiobus_free(). Fixes: 7897b071ac3b ("net: macb: convert to phylink") Signed-off-by: Claudiu Beznea --- drivers/net/ethernet/cadence/macb_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index cebae0f418f2..73d041af3de1 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5165,11 +5165,11 @@ static void macb_remove(struct platform_device *pdev) if (dev) { bp = netdev_priv(dev); + unregister_netdev(dev); phy_exit(bp->sgmii_phy); mdiobus_unregister(bp->mii_bus); mdiobus_free(bp->mii_bus); - unregister_netdev(dev); tasklet_kill(&bp->hresp_err_tasklet); pm_runtime_disable(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev);