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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1F85C07E9E for ; Sat, 10 Jul 2021 02:32:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBA70613E8 for ; Sat, 10 Jul 2021 02:32:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235613AbhGJCez (ORCPT ); Fri, 9 Jul 2021 22:34:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:48606 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233666AbhGJCaC (ORCPT ); Fri, 9 Jul 2021 22:30:02 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1F6FA613F8; Sat, 10 Jul 2021 02:27:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625884037; bh=iuvqrOQnfusmSwhXeWQuhvfyb5auvpsZO6YgTr7k21M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DTJpckdsNBnvpb67DGqV0KXfa1iIhVsC0Stydg086OIO8KpUokUsdD/nuANLfL8Js E++bcAs1hU176VxqNJF2kOG0vV9TeuZSpujQP9Cck/TUUAMkFK1Y/wFrN7gdz3gzkx TuPe5/S8o4ui41Omi42FaP28DUIVlyVliJUSG41ld2jtQnuJELpPmF7i9VDcLnxypu QixX9PhdSEuUXasaN/zgJMuGb3bbV6bZdzqYo5D/2xGneElqsTs1fLPv8r2tNgSN2G on6ysuzPO+hPdxac8y9vmpBglXC7QdNAi5GmvvvRd86DFdbW2G8S1DxtCQzyQJUHvw ckd7vz9RdpxEg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tong Zhang , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH AUTOSEL 5.4 06/63] misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge Date: Fri, 9 Jul 2021 22:26:12 -0400 Message-Id: <20210710022709.3170675-6-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210710022709.3170675-1-sashal@kernel.org> References: <20210710022709.3170675-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tong Zhang [ Upstream commit 3ce3e45cc333da707d4d6eb433574b990bcc26f5 ] There is an issue with the ASPM(optional) capability checking function. A device might be attached to root complex directly, in this case, bus->self(bridge) will be NULL, thus priv->parent_pdev is NULL. Since alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's ASPM capability and populate parent_cap_off, which will be used later by alcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do here is to avoid checking the capability if we are on the root complex. This will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply return when bring called, effectively disable ASPM for the device. [ 1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0 [ 1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [ 1.253998] Call Trace: [ 1.254131] ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci] Co-developed-by: Greg Kroah-Hartman Signed-off-by: Tong Zhang Link: https://lore.kernel.org/r/20210513040732.1310159-1-ztong0001@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/misc/cardreader/alcor_pci.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/misc/cardreader/alcor_pci.c b/drivers/misc/cardreader/alcor_pci.c index 259fe1dfec03..afd409a5efae 100644 --- a/drivers/misc/cardreader/alcor_pci.c +++ b/drivers/misc/cardreader/alcor_pci.c @@ -133,7 +133,13 @@ static void alcor_pci_init_check_aspm(struct alcor_pci_priv *priv) u32 val32; priv->pdev_cap_off = alcor_pci_find_cap_offset(priv, priv->pdev); - priv->parent_cap_off = alcor_pci_find_cap_offset(priv, + /* + * A device might be attached to root complex directly and + * priv->parent_pdev will be NULL. In this case we don't check its + * capability and disable ASPM completely. + */ + if (!priv->parent_pdev) + priv->parent_cap_off = alcor_pci_find_cap_offset(priv, priv->parent_pdev); if ((priv->pdev_cap_off == 0) || (priv->parent_cap_off == 0)) { -- 2.30.2