From patchwork Mon Mar 6 07:56:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 660687 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 918CCC77B76 for ; Mon, 6 Mar 2023 07:57:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229587AbjCFH5v (ORCPT ); Mon, 6 Mar 2023 02:57:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229825AbjCFH5m (ORCPT ); Mon, 6 Mar 2023 02:57:42 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6E6861F915; Sun, 5 Mar 2023 23:57:40 -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 E046CB80CAE; Mon, 6 Mar 2023 07:57:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF842C43613; Mon, 6 Mar 2023 07:57:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1678089456; bh=FWxTZ1RqwVoujtqnJ/DHFooDHNoVoslTBxHPXwHinZ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rb98aC/USRF/Y/JkuE/QfcURA1eAUgT93VlR7oRB9fIW6LTsoJZ+ysppaHYnfnWFS JUo4ip+MDmAGqm3Qi4xS5sZfVPh6TGaKNm5t4uUpZWZiqRM7WGIsLJoeIMLEvFVYGN 1ex8LZf6yrBHihzSG0DXn4MyCQJi+y8DfSlN4EfsS72rhpRhDtBWg8MY0FdjoRpcs4 +sfTFxLHx9gl/KqyX2TA8o28BTrBEV067U0ulefeRLls36NP27QnimPaXNaXbbhpFA T/s+QbTaKD6kThWnDslBBc+Cm+V+i3jkHNX0TTvEFBnV3bcyahpekDhSkdmOlM1/HM 1UEeB1kxc2Xbw== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pZ5jd-0000iZ-2h; Mon, 06 Mar 2023 08:58:17 +0100 From: Johan Hovold To: Georgi Djakov Cc: "Shawn Guo" , "Sascha Hauer" , "Pengutronix Kernel Team" , "Fabio Estevam" , "NXP Linux Team" , "Andy Gross" , "Bjorn Andersson" , "Konrad Dybcio" , "Sylwester Nawrocki" , =?utf-8?b?QXJ0dXIgxZp3aWdv?= =?utf-8?b?xYQ=?= , "Krzysztof Kozlowski" , "Alim Akhtar" , "Thierry Reding" , "Jonathan Hunter" , linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org Subject: [PATCH v2 15/23] interconnect: exynos: fix registration race Date: Mon, 6 Mar 2023 08:56:43 +0100 Message-Id: <20230306075651.2449-16-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230306075651.2449-1-johan+linaro@kernel.org> References: <20230306075651.2449-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The current interconnect provider registration interface is inherently racy as nodes are not added until the after adding the provider. This can specifically cause racing DT lookups to trigger a NULL-pointer deference when either a NULL pointer or not fully initialised node is returned from exynos_generic_icc_xlate(). Switch to using the new API where the provider is not registered until after it has been fully initialised. Fixes: 2f95b9d5cf0b ("interconnect: Add generic interconnect driver for Exynos SoCs") Cc: stable@vger.kernel.org # 5.11 Cc: Sylwester Nawrocki Reviewed-by: Krzysztof Kozlowski Signed-off-by: Johan Hovold --- drivers/interconnect/samsung/exynos.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/interconnect/samsung/exynos.c b/drivers/interconnect/samsung/exynos.c index e70665899482..72e42603823b 100644 --- a/drivers/interconnect/samsung/exynos.c +++ b/drivers/interconnect/samsung/exynos.c @@ -98,12 +98,13 @@ static int exynos_generic_icc_remove(struct platform_device *pdev) struct exynos_icc_priv *priv = platform_get_drvdata(pdev); struct icc_node *parent_node, *node = priv->node; + icc_provider_deregister(&priv->provider); + parent_node = exynos_icc_get_parent(priv->dev->parent->of_node); if (parent_node && !IS_ERR(parent_node)) icc_link_destroy(node, parent_node); icc_nodes_remove(&priv->provider); - icc_provider_del(&priv->provider); return 0; } @@ -132,15 +133,11 @@ static int exynos_generic_icc_probe(struct platform_device *pdev) provider->inter_set = true; provider->data = priv; - ret = icc_provider_add(provider); - if (ret < 0) - return ret; + icc_provider_init(provider); icc_node = icc_node_create(pdev->id); - if (IS_ERR(icc_node)) { - ret = PTR_ERR(icc_node); - goto err_prov_del; - } + if (IS_ERR(icc_node)) + return PTR_ERR(icc_node); priv->node = icc_node; icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", @@ -171,14 +168,17 @@ static int exynos_generic_icc_probe(struct platform_device *pdev) goto err_pmqos_del; } + ret = icc_provider_register(provider); + if (ret < 0) + goto err_pmqos_del; + return 0; err_pmqos_del: dev_pm_qos_remove_request(&priv->qos_req); err_node_del: icc_nodes_remove(provider); -err_prov_del: - icc_provider_del(provider); + return ret; }