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 BC68EC7618A for ; Mon, 20 Mar 2023 15:35:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233040AbjCTPfR (ORCPT ); Mon, 20 Mar 2023 11:35:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233193AbjCTPet (ORCPT ); Mon, 20 Mar 2023 11:34:49 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5220836FE8 for ; Mon, 20 Mar 2023 08:27:30 -0700 (PDT) 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 47046B80EC8 for ; Mon, 20 Mar 2023 15:27:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0255C433EF; Mon, 20 Mar 2023 15:27:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679326047; bh=XXgsjh20dOOAVU9aBn8zTTQ9u5yTkBonbr3FD3pyifw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QVOMPooO4qd7uYn1guvQr8qd/L5ykr6iIidZ58h/QDnR5Nj7ihl+QjhZptHOtnGKW uR2WQhgFx8fkTEOfWN4KLF9b8T10/tmQ4QfLhWKNWtGSTkHGM1AbCL9yetu7Ale77M HwKbFRQml+8gTv2HlTbUu7pbXsKsTmU2CRhsAmxs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sylwester Nawrocki , Krzysztof Kozlowski , Johan Hovold , Georgi Djakov Subject: [PATCH 6.2 141/211] interconnect: exynos: fix registration race Date: Mon, 20 Mar 2023 15:54:36 +0100 Message-Id: <20230320145519.339447976@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145513.305686421@linuxfoundation.org> References: <20230320145513.305686421@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: Johan Hovold commit c9e46ca612cfbb0cf890f7ae7389b742e90efe64 upstream. 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 Link: https://lore.kernel.org/r/20230306075651.2449-16-johan+linaro@kernel.org Signed-off-by: Georgi Djakov Signed-off-by: Greg Kroah-Hartman --- drivers/interconnect/samsung/exynos.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) --- a/drivers/interconnect/samsung/exynos.c +++ b/drivers/interconnect/samsung/exynos.c @@ -98,12 +98,13 @@ static int exynos_generic_icc_remove(str 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(stru 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(stru 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; }